stock_valuation_xlsx: first port to v14 without price history (when you ask for a past price, you get the current price for the moment)

stock_valuation_xlsx/__manifest__.py

@@ -1,4 +1,4 @@
-# Copyright 2020 Akretion France (http://www.akretion.com)
+# Copyright 2020-2021 Akretion France (http://www.akretion.com)
 # @author Alexis de Lattre <alexis.delattre@akretion.com>
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 

stock_valuation_xlsx/models/__init__.py

@@ -0,0 +1 @@
+from . import stock_expiry_depreciation_rule

stock_valuation_xlsx/models/stock_expiry_depreciation_rule.py

@@ -0,0 +1,35 @@
+# Copyright 2021 Akretion France (http://www.akretion.com/)
+# @author: Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class StockExpiryDepreciationRule(models.Model):
+    _name = 'stock.expiry.depreciation.rule'
+    _description = 'Stock Expiry Depreciation Rule'
+    _order = 'company_id, start_limit_days'
+
+    company_id = fields.Many2one(
+        'res.company', string='Company',
+        ondelete='cascade', required=True,
+        default=lambda self: self.env.company)
+    start_limit_days = fields.Integer(
+        string='Days Before/After Expiry', required=True,
+        help="Enter negative value for days before expiry. Enter positive values for days after expiry. This value is the START of the time interval when going from future to past.")
+    ratio = fields.Integer(string='Depreciation Ratio (%)', required=True)
+    name = fields.Char(string='Label')
+
+    _sql_constraints = [(
+        'ratio_positive',
+        'CHECK(ratio >= 0)',
+        'The depreciation ratio must be positive.'
+        ), (
+        'ratio_max',
+        'CHECK(ratio <= 100)',
+        'The depreciation ratio cannot be above 100%.'
+        ), (
+        'start_limit_days_unique',
+        'unique(company_id, start_limit_days)',
+        'This depreciation rule already exists in this company.'
+        )]

stock_valuation_xlsx/security/ir.model.access.csv

@@ -0,0 +1,5 @@
+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
+access_stock_expiry_depreciation_rule_full,Full access on stock.expiry.depreciation.rule to account manager,model_stock_expiry_depreciation_rule,account.group_account_manager,1,1,1,1
+access_stock_expiry_depreciation_rule_read,Read access on stock.expiry.depreciation.rule to stock manager,model_stock_expiry_depreciation_rule,stock.group_stock_manager,1,0,0,0
+access_stock_valuation_xlsx,stock.valuation.xlsx wizard,model_stock_valuation_xlsx,stock.group_stock_user,1,1,1,0
+access_stock_variation_xlsx,stock.variation.xlsx wizard,model_stock_variation_xlsx,stock.group_stock_user,1,1,1,0

stock_valuation_xlsx/views/stock_expiry_depreciation_rule.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright 2021 Akretion France (http://www.akretion.com/)
+  @author: Alexis de Lattre <alexis.delattre@akretion.com>
+  License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+-->
+
+<odoo>
+<data>
+
+<record id="stock_expiry_depreciation_rule_tree" model="ir.ui.view">
+    <field name="model">stock.expiry.depreciation.rule</field>
+    <field name="arch" type="xml">
+        <tree editable="bottom">
+            <field name="start_limit_days"/>
+            <field name="ratio"/>
+            <field name="name"/>
+            <field name="company_id" groups="base.group_multi_company"/>
+        </tree>
+    </field>
+</record>
+
+<record id="stock_expiry_depreciation_rule_action" model="ir.actions.act_window">
+    <field name="name">Stock Depreciation Rules</field>
+    <field name="res_model">stock.expiry.depreciation.rule</field>
+    <field name="view_mode">tree</field>
+</record>
+
+<menuitem id="stock_expiry_depreciation_rule_menu"
+        action="stock_expiry_depreciation_rule_action"
+        parent="account.account_management_menu"
+        sequence="100"/>
+
+</data>
+</odoo>

stock_valuation_xlsx/wizard/stock_valuation_xlsx.py

@@ -17,69 +17,53 @@ logger = logging.getLogger(__name__)
 
 class StockValuationXlsx(models.TransientModel):
     _name = 'stock.valuation.xlsx'
+    _check_company_auto = True
     _description = 'Generate XLSX report for stock valuation'
 
     export_file = fields.Binary(string='XLSX Report', readonly=True, attachment=True)
     export_filename = fields.Char(readonly=True)
-    # I don't use ir.actions.url on v12, because it renders
+    company_id = fields.Many2one(
-    # the wizard unusable after the first report generation, which creates
+        'res.company', string='Company', default=lambda self: self.env.company,
-    # a lot of confusion for users
+        required=True)
-    state = fields.Selection([
-        ('setup', 'Setup'),
-        ('done', 'Done'),
-        ], string='State', default='setup', readonly=True)
     warehouse_id = fields.Many2one(
-        'stock.warehouse', string='Warehouse',
+        'stock.warehouse', string='Warehouse', check_company=True,
-        states={'done': [('readonly', True)]})
+        domain="[('company_id', '=', company_id)]")
     location_id = fields.Many2one(
         'stock.location', string='Root Stock Location', required=True,
-        domain=[('usage', 'in', ('view', 'internal'))],
+        domain="[('usage', 'in', ('view', 'internal')), ('company_id', '=', company_id)]",
-        default=lambda self: self._default_location(),
+        default=lambda self: self._default_location(), check_company=True,
-        states={'done': [('readonly', True)]},
         help="The childen locations of the selected locations will "
-        u"be taken in the valuation.")
+        "be taken in the valuation.")
     categ_ids = fields.Many2many(
         'product.category', string='Product Category Filter',
         help="Leave this field empty to have a stock valuation for all your products.",
-        states={'done': [('readonly', True)]},
         )
     source = fields.Selection([
         ('inventory', 'Physical Inventory'),
         ('stock', 'Stock Levels'),
-        ], string='Source data', default='stock', required=True,
+        ], string='Source data', default='stock', required=True)
-        states={'done': [('readonly', True)]})
     inventory_id = fields.Many2one(
-        'stock.inventory', string='Inventory', domain=[('state', '=', 'done')],
+        'stock.inventory', string='Inventory', check_company=True,
-        states={'done': [('readonly', True)]})
+        domain="[('state', '=', 'done'), ('company_id', '=', company_id)]")
     stock_date_type = fields.Selection([
         ('present', 'Present'),
         ('past', 'Past'),
-        ], string='Present or Past', default='present',
+        ], string='Present or Past', default='present')
-        states={'done': [('readonly', True)]})
     past_date = fields.Datetime(
-        string='Past Date', states={'done': [('readonly', True)]},
+        string='Past Date', default=fields.Datetime.now)
-        default=fields.Datetime.now)
     categ_subtotal = fields.Boolean(
         string='Subtotals per Categories', default=True,
-        states={'done': [('readonly', True)]},
         help="Show a subtotal per product category.")
     standard_price_date = fields.Selection([
         ('past', 'Past Date or Inventory Date'),
         ('present', 'Current'),
-        ], default='past', string='Cost Price Date',
+        ], default='past', string='Cost Price Date')
-        states={'done': [('readonly', True)]})
-    # I can't put a compute field for has_expiry_date
-    # because I want to have the value when the wizard is started,
-    # and not wait until run
     has_expiry_date = fields.Boolean(
         default=lambda self: self._default_has_expiry_date(), readonly=True)
     apply_depreciation = fields.Boolean(
-        string='Apply Depreciation Rules', default=True,
+        string='Apply Depreciation Rules', default=True)
-        states={'done': [('readonly', True)]})
+    split_by_lot = fields.Boolean(string='Display Lots')
-    split_by_lot = fields.Boolean(
+    split_by_location = fields.Boolean(string='Display Stock Locations')
-        string='Display Lots', states={'done': [('readonly', True)]})
-    split_by_location = fields.Boolean(
-        string='Display Stock Locations', states={'done': [('readonly', True)]})
 
     @api.model
     def _default_has_expiry_date(self):
@@ -145,7 +129,7 @@ class StockValuationXlsx(models.TransientModel):
     def _prepare_expiry_depreciation_rules(self, company_id, past_date):
         rules = self.env['stock.expiry.depreciation.rule'].search_read([('company_id', '=', company_id)], ['start_limit_days', 'ratio'], order='start_limit_days desc')
         if past_date:
-            date_dt = past_date
+            date_dt = fields.Date.to_date(past_date)  # convert datetime to date
         else:
             date_dt = fields.Date.context_today(self)
         for rule in rules:
@@ -158,23 +142,25 @@ class StockValuationXlsx(models.TransientModel):
         self.ensure_one()
         logger.debug('Start compute_product_data')
         ppo = self.env['product.product']
-        ppho = self.env['product.price.history']
         fields_list = self._prepare_product_fields()
-        if not standard_price_past_date:
+        # if not standard_price_past_date:  # TODO
+        if True:
             fields_list.append('standard_price')
         products = ppo.search_read([('id', 'in', in_stock_product_ids)], fields_list)
         product_id2data = {}
         for p in products:
             logger.debug('p=%d', p['id'])
-            # I don't call the native method get_history_price()
-            # because it requires a browse record and it is too slow
             if standard_price_past_date:
-                history = ppho.search_read([
+                # No more product.price.history on v14
-                    ('company_id', '=', company_id),
+                # We are supposed to use stock.valuation.layer.revaluation
-                    ('product_id', '=', p['id']),
+                # TODO migrate to stock.valuation.layer.revaluation
-                    ('datetime', '<=', standard_price_past_date)],
+                #history = ppho.search_read([
-                    ['cost'], order='datetime desc, id desc', limit=1)
+                #    ('company_id', '=', company_id),
-                standard_price = history and history[0]['cost'] or 0.0
+                #    ('product_id', '=', p['id']),
+                #    ('datetime', '<=', standard_price_past_date)],
+                #    ['cost'], order='datetime desc, id desc', limit=1)
+                #standard_price = history and history[0]['cost'] or 0.0
+                standard_price = p['standard_price']  # TODO remove this tmp stuff
             else:
                 standard_price = p['standard_price']
             product_id2data[p['id']] = {'standard_price': standard_price}
@@ -363,10 +349,9 @@ class StockValuationXlsx(models.TransientModel):
     def generate(self):
         self.ensure_one()
         logger.debug('Start generate XLSX stock valuation report')
-        splo = self.env['stock.production.lot'].with_context(active_test=False)
         prec_qty = self.env['decimal.precision'].precision_get('Product Unit of Measure')
         prec_price = self.env['decimal.precision'].precision_get('Product Price')
-        company = self.env.user.company_id
+        company = self.company_id
         company_id = company.id
         prec_cur_rounding = company.currency_id.rounding
         self._check_config(company_id)
@@ -548,21 +533,17 @@ class StockValuationXlsx(models.TransientModel):
         filename = 'Odoo_stock_%s.xlsx' % stock_time_str.replace(' ', '-').replace(':', '_')
         export_file_b64 = base64.b64encode(file_data.read())
         self.write({
-            'state': 'done',
             'export_filename': filename,
             'export_file': export_file_b64,
             })
-        # action = {
+        action = {
-        #    'name': _('Stock Valuation XLSX'),
+            'name': _('Stock Valuation XLSX'),
-        #    'type': 'ir.actions.act_url',
+            'type': 'ir.actions.act_url',
-        #    'url': "web/content/?model=%s&id=%d&filename_field=export_filename&"
+            'url': "web/content/?model=%s&id=%d&filename_field=export_filename&"
-        #           "field=export_file&download=true&filename=%s" % (
+                   "field=export_file&download=true&filename=%s" % (
-        #               self._name, self.id, self.export_filename),
+                       self._name, self.id, self.export_filename),
-        #    'target': 'self',
+            'target': 'new',
-        #    }
+            }
-        action = self.env['ir.actions.act_window'].for_xml_id(
-            'stock_valuation_xlsx', 'stock_valuation_xlsx_action')
-        action['res_id'] = self.id
         return action
 
     def _prepare_styles(self, workbook, company, prec_price):
@@ -570,8 +551,8 @@ class StockValuationXlsx(models.TransientModel):
         categ_bg_color = '#e1daf5'
         col_title_bg_color = '#fff9b4'
         regular_font_size = 10
-        currency_num_format = u'# ### ##0.00 %s' % company.currency_id.symbol
+        currency_num_format = '# ### ##0.00 %s' % company.currency_id.symbol
-        price_currency_num_format = u'# ### ##0.%s %s' % ('0' * prec_price, company.currency_id.symbol)
+        price_currency_num_format = '# ### ##0.%s %s' % ('0' * prec_price, company.currency_id.symbol)
         styles = {
             'doc_title': workbook.add_format({
                 'bold': True, 'font_size': regular_font_size + 10,
@@ -591,7 +572,7 @@ class StockValuationXlsx(models.TransientModel):
             'regular_date': workbook.add_format({'num_format': 'dd/mm/yyyy'}),
             'regular_currency': workbook.add_format({'num_format': currency_num_format}),
             'regular_price_currency': workbook.add_format({'num_format': price_currency_num_format}),
-            'regular_int_percent': workbook.add_format({'num_format': u'0.%'}),
+            'regular_int_percent': workbook.add_format({'num_format': '0.%'}),
             'regular': workbook.add_format({}),
             'regular_small': workbook.add_format({'font_size': regular_font_size - 2}),
             'categ_title': workbook.add_format({

stock_valuation_xlsx/wizard/stock_valuation_xlsx_view.xml

@@ -17,7 +17,7 @@
                 <p>The generated XLSX report has the valuation of stockable products located on the selected stock locations (and their childrens).</p>
             </div>
             <group name="setup">
-                <field name="state" invisible="1"/>
+                <field name="company_id" groups="base.group_multi_company"/>
                 <field name="categ_ids" widget="many2many_tags"/>
                 <field name="warehouse_id"/>
                 <field name="location_id"/>
@@ -32,15 +32,9 @@
                 <field name="split_by_location" attrs="{'invisible': [('source', '=', 'stock'), ('stock_date_type', '=', 'past')]}"/>
                 <field name="apply_depreciation" groups="stock.group_production_lot" attrs="{'invisible': ['|', '|', ('split_by_lot', '=', False), ('has_expiry_date', '=', False), '&amp;', ('source', '=', 'stock'), ('stock_date_type', '=', 'past')]}"/>
             </group>
-            <group name="done" states="done" string="Result">
-                <field name="export_file" filename="export_filename"/>
-                <field name="export_filename" invisible="1"/>
-            </group>
             <footer>
-                <button name="generate" type="object" states="setup"
+                <button name="generate" type="object" class="btn-primary" string="Generate"/>
-                    class="btn-primary" string="Generate"/>
+                <button special="cancel" string="Close" class="btn-default"/>
-                <button special="cancel" string="Cancel" class="btn-default" states="setup"/>
-                <button special="cancel" string="Close" class="btn-default" states="done"/>
             </footer>
         </form>
     </field>

stock_valuation_xlsx/wizard/stock_variation_xlsx.py

@@ -0,0 +1,458 @@
+# Copyright 2020-2021 Akretion France (http://www.akretion.com/)
+# @author Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import models, fields, api, _
+from odoo.exceptions import UserError
+from odoo.tools import float_is_zero, float_round
+from io import BytesIO
+import base64
+from datetime import datetime
+import xlsxwriter
+import logging
+logger = logging.getLogger(__name__)
+
+
+class StockVariationXlsx(models.TransientModel):
+    _name = 'stock.variation.xlsx'
+    _check_company_auto = True
+    _description = 'Generate XLSX report for stock valuation variation between 2 dates'
+
+    export_file = fields.Binary(string='XLSX Report', readonly=True, attachment=True)
+    export_filename = fields.Char(readonly=True)
+    company_id = fields.Many2one(
+        'res.company', string='Company', default=lambda self: self.env.company,
+        required=True)
+    warehouse_id = fields.Many2one(
+        'stock.warehouse', string='Warehouse', check_company=True,
+        domain="[('company_id', '=', company_id)]")
+    location_id = fields.Many2one(
+        'stock.location', string='Root Stock Location', required=True,
+        domain="[('usage', 'in', ('view', 'internal')), ('company_id', '=', company_id)]",
+        default=lambda self: self._default_location(), check_company=True,
+        help="The childen locations of the selected locations will "
+        "be taken in the valuation.")
+    categ_ids = fields.Many2many(
+        'product.category', string='Product Category Filter',
+        help="Leave this fields empty to have a stock valuation for all your products.")
+    start_date = fields.Datetime(
+        string='Start Date', required=True)
+    standard_price_start_date_type = fields.Selection([
+        ('start', 'Start Date'),
+        ('present', 'Current'),
+        ], default='start', required=True,
+        string='Cost Price for Start Date')
+    end_date_type = fields.Selection([
+        ('present', 'Present'),
+        ('past', 'Past'),
+        ], string='End Date Type', default='present', required=True)
+    end_date = fields.Datetime(
+        string='End Date', default=fields.Datetime.now)
+    standard_price_end_date_type = fields.Selection([
+        ('end', 'End Date'),
+        ('present', 'Current'),
+        ], default='end', string='Cost Price for End Date', required=True)
+    categ_subtotal = fields.Boolean(
+        string='Subtotals per Categories', default=True,
+        help="Show a subtotal per product category.")
+
+    @api.model
+    def _default_location(self):
+        wh = self.env.ref('stock.warehouse0')
+        return wh.lot_stock_id
+
+    @api.onchange('warehouse_id')
+    def warehouse_id_change(self):
+        if self.warehouse_id:
+            self.location_id = self.warehouse_id.view_location_id.id
+
+    def _check_config(self, company_id):
+        self.ensure_one()
+        present = fields.Datetime.now()
+        if self.end_date_type == 'past':
+            if not self.end_date:
+                raise UserError(_("End Date is missing."))
+            if self.end_date > present:
+                raise UserError(_("The end date must be in the past."))
+            if self.end_date <= self.start_date:
+                raise UserError(_("The start date must be before the end date."))
+        else:
+            if self.start_date >= present:
+                raise UserError(_("The start date must be in the past."))
+        cost_method_real_count = self.env['ir.property'].search([
+            ('company_id', '=', company_id),
+            ('name', '=', 'property_cost_method'),
+            ('value_text', '=', 'real'),
+            ('type', '=', 'selection'),
+            ], count=True)
+        if cost_method_real_count:
+            raise UserError(_(
+                "There are %d properties that have "
+                "'Costing Method' = 'Real Price'. This costing "
+                "method is not supported by this module.")
+                % cost_method_real_count)
+
+    def _prepare_product_domain(self):
+        self.ensure_one()
+        domain = [('type', '=', 'product')]
+        if self.categ_ids:
+            domain += [('categ_id', 'child_of', self.categ_ids.ids)]
+        return domain
+
+    def get_product_ids(self):
+        self.ensure_one()
+        domain = self._prepare_product_domain()
+        # Should we also add inactive products ??
+        products = self.env['product.product'].search(domain)
+        return products.ids
+
+    def _prepare_product_fields(self):
+        return ['uom_id', 'name', 'default_code', 'categ_id']
+
+    def compute_product_data(
+            self, company_id, filter_product_ids,
+            standard_price_start_date=False, standard_price_end_date=False):
+        self.ensure_one()
+        logger.debug('Start compute_product_data')
+        ppo = self.env['product.product']
+        fields_list = self._prepare_product_fields()
+        # if not standard_price_start_date or not standard_price_end_date:  # TODO
+        if True:
+            fields_list.append('standard_price')
+        products = ppo.search_read([('id', 'in', filter_product_ids)], fields_list)
+        product_id2data = {}
+        for p in products:
+            logger.debug('p=%d', p['id'])
+            if standard_price_start_date:
+                # No more product.price.history on v14
+                # We are supposed to use stock.valuation.layer.revaluation
+                # TODO migrate to stock.valuation.layer.revaluation
+                #history = ppho.search_read([
+                #    ('company_id', '=', company_id),
+                #    ('product_id', '=', p['id']),
+                #    ('datetime', '<=', standard_price_start_date)],
+                #    ['cost'], order='datetime desc, id desc', limit=1)
+                #start_standard_price = history and history[0]['cost'] or 0.0
+                start_standard_price = p['standard_price']  # TODO remove this tmp stuff
+            else:
+                start_standard_price = p['standard_price']
+            if standard_price_end_date:
+                #history = ppho.search_read([
+                #    ('company_id', '=', company_id),
+                #    ('product_id', '=', p['id']),
+                #    ('datetime', '<=', standard_price_end_date)],
+                #    ['cost'], order='datetime desc, id desc', limit=1)
+                #end_standard_price = history and history[0]['cost'] or 0.0
+                end_standard_price = p['standard_price']  # TODO remove this tmp stuff
+            else:
+                end_standard_price = p['standard_price']
+
+            product_id2data[p['id']] = {
+                'start_standard_price': start_standard_price,
+                'end_standard_price': end_standard_price,
+                }
+            for pfield in fields_list:
+                if pfield.endswith('_id'):
+                    product_id2data[p['id']][pfield] = p[pfield][0]
+                else:
+                    product_id2data[p['id']][pfield] = p[pfield]
+        logger.debug('End compute_product_data')
+        return product_id2data
+
+    def compute_data_from_stock(self, product_ids, prec_qty, start_date, end_date_type, end_date, company_id):
+        self.ensure_one()
+        logger.debug('Start compute_data_from_stock past_date=%s end_date_type=%s, end_date=%s', start_date, end_date_type, end_date)
+        ppo = self.env['product.product']
+        smo = self.env['stock.move']
+        sqo = self.env['stock.quant']
+        ppo_loc = ppo.with_context(location=self.location_id.id).with_company(company_id)
+        # Inspired by odoo/addons/stock/models/product.py
+        # method _compute_quantities_dict()
+        domain_quant_loc, domain_move_in_loc, domain_move_out_loc = ppo_loc._get_domain_locations()
+        domain_quant = [('product_id', 'in', product_ids)] + domain_quant_loc
+        domain_move_in = [('product_id', 'in', product_ids), ('state', '=', 'done')] + domain_move_in_loc
+        domain_move_out = [('product_id', 'in', product_ids), ('state', '=', 'done')] + domain_move_out_loc
+        quants_res = dict((item['product_id'][0], item['quantity']) for item in sqo.read_group(domain_quant, ['product_id', 'quantity'], ['product_id'], orderby='id'))
+        domain_move_in_start_to_end = [('date', '>', start_date)] + domain_move_in
+        domain_move_out_start_to_end = [('date', '>', start_date)] + domain_move_out
+        if end_date_type == 'past':
+
+            domain_move_in_end_to_present = [('date', '>', end_date)] + domain_move_in
+            domain_move_out_end_to_present = [('date', '>', end_date)] + domain_move_out
+            moves_in_res_end_to_present = dict((item['product_id'][0], item['product_qty']) for item in smo.read_group(domain_move_in_end_to_present, ['product_id', 'product_qty'], ['product_id'], orderby='id'))
+            moves_out_res_end_to_present = dict((item['product_id'][0], item['product_qty']) for item in smo.read_group(domain_move_out_end_to_present, ['product_id', 'product_qty'], ['product_id'], orderby='id'))
+
+            domain_move_in_start_to_end += [('date', '<', end_date)]
+            domain_move_out_start_to_end += [('date', '<', end_date)]
+
+        moves_in_res_start_to_end = dict((item['product_id'][0], item['product_qty']) for item in smo.read_group(domain_move_in_start_to_end, ['product_id', 'product_qty'], ['product_id'], orderby='id'))
+        moves_out_res_start_to_end = dict((item['product_id'][0], item['product_qty']) for item in smo.read_group(domain_move_out_start_to_end, ['product_id', 'product_qty'], ['product_id'], orderby='id'))
+
+        product_data = {}  # key = product_id , value = dict
+        for product in ppo.browse(product_ids):
+            end_qty = quants_res.get(product.id, 0.0)
+            if end_date_type == 'past':
+                end_qty += moves_out_res_end_to_present.get(product.id, 0.0) - moves_in_res_end_to_present.get(product.id, 0.0)
+            in_qty = moves_in_res_start_to_end.get(product.id, 0.0)
+            out_qty = moves_out_res_start_to_end.get(product.id, 0.0)
+            start_qty = end_qty - in_qty + out_qty
+            if (
+                    not float_is_zero(start_qty, precision_digits=prec_qty) or
+                    not float_is_zero(in_qty, precision_digits=prec_qty) or
+                    not float_is_zero(out_qty, precision_digits=prec_qty) or
+                    not float_is_zero(end_qty, precision_digits=prec_qty)):
+                product_data[product.id] = {
+                    'product_id': product.id,
+                    'start_qty': start_qty,
+                    'in_qty': in_qty,
+                    'out_qty': out_qty,
+                    'end_qty': end_qty,
+                    }
+        logger.debug('End compute_data_from_stock')
+        return product_data
+
+    def stringify_and_sort_result(
+            self, product_data, product_id2data, prec_qty, prec_price, prec_cur_rounding,
+            categ_id2name, uom_id2name):
+        logger.debug('Start stringify_and_sort_result')
+        res = []
+        for product_id, l in product_data.items():
+            start_qty = float_round(l['start_qty'], precision_digits=prec_qty)
+            in_qty = float_round(l['in_qty'], precision_digits=prec_qty)
+            out_qty = float_round(l['out_qty'], precision_digits=prec_qty)
+            end_qty = float_round(l['end_qty'], precision_digits=prec_qty)
+            start_standard_price = float_round(
+                product_id2data[product_id]['start_standard_price'],
+                precision_digits=prec_price)
+            end_standard_price = float_round(
+                product_id2data[product_id]['end_standard_price'],
+                precision_digits=prec_price)
+            start_subtotal = float_round(
+                start_standard_price * start_qty, precision_rounding=prec_cur_rounding)
+            end_subtotal = float_round(
+                end_standard_price * end_qty, precision_rounding=prec_cur_rounding)
+            variation = float_round(
+                end_subtotal - start_subtotal, precision_rounding=prec_cur_rounding)
+            res.append(dict(
+                product_id2data[product_id],
+                product_name=product_id2data[product_id]['name'],
+                start_qty=start_qty,
+                start_standard_price=start_standard_price,
+                start_subtotal=start_subtotal,
+                in_qty=in_qty,
+                out_qty=out_qty,
+                end_qty=end_qty,
+                end_standard_price=end_standard_price,
+                end_subtotal=end_subtotal,
+                variation=variation,
+                uom_name=uom_id2name[product_id2data[product_id]['uom_id']],
+                categ_name=categ_id2name[product_id2data[product_id]['categ_id']],
+                ))
+        sort_res = sorted(res, key=lambda x: x['product_name'])
+        logger.debug('End stringify_and_sort_result')
+        return sort_res
+
+    def generate(self):
+        self.ensure_one()
+        logger.debug('Start generate XLSX stock variation report')
+        svxo = self.env['stock.valuation.xlsx']
+        prec_qty = self.env['decimal.precision'].precision_get('Product Unit of Measure')
+        prec_price = self.env['decimal.precision'].precision_get('Product Price')
+        company = self.company_id
+        company_id = company.id
+        prec_cur_rounding = company.currency_id.rounding
+        self._check_config(company_id)
+
+        product_ids = self.get_product_ids()
+        if not product_ids:
+            raise UserError(_("There are no products to analyse."))
+
+        product_data = self.compute_data_from_stock(
+            product_ids, prec_qty, self.start_date, self.end_date_type, self.end_date,
+            company_id)
+        standard_price_start_date = standard_price_end_date = False
+        if self.standard_price_start_date_type == 'start':
+            standard_price_start_date = self.start_date
+        if self.standard_price_end_date_type == 'end':
+            standard_price_end_date = self.end_date
+
+        product_id2data = self.compute_product_data(
+            company_id, list(product_data.keys()),
+            standard_price_start_date, standard_price_end_date)
+        categ_id2name = svxo.product_categ_id2name(self.categ_ids)
+        uom_id2name = svxo.uom_id2name()
+        res = self.stringify_and_sort_result(
+            product_data, product_id2data, prec_qty, prec_price, prec_cur_rounding,
+            categ_id2name, uom_id2name)
+
+        logger.debug('Start create XLSX workbook')
+        file_data = BytesIO()
+        workbook = xlsxwriter.Workbook(file_data)
+        sheet = workbook.add_worksheet('Stock_Variation')
+        styles = svxo._prepare_styles(workbook, company, prec_price)
+        cols = self._prepare_cols()
+        categ_subtotal = self.categ_subtotal
+        # remove cols that we won't use
+        if not categ_subtotal:
+            cols.pop('categ_subtotal', None)
+
+        j = 0
+        for col, col_vals in sorted(cols.items(), key=lambda x: x[1]['sequence']):
+            cols[col]['pos'] = j
+            cols[col]['pos_letter'] = chr(j + 97).upper()
+            sheet.set_column(j, j, cols[col]['width'])
+            j += 1
+
+        # HEADER
+        now_dt = fields.Datetime.context_timestamp(self, datetime.now())
+        now_str = fields.Datetime.to_string(now_dt)
+        start_time_utc_dt = self.start_date
+        start_time_dt = fields.Datetime.context_timestamp(self, start_time_utc_dt)
+        start_time_str = fields.Datetime.to_string(start_time_dt)
+        if self.end_date_type == 'past':
+            end_time_utc_dt = self.end_date
+            end_time_dt = fields.Datetime.context_timestamp(self, end_time_utc_dt)
+            end_time_str = fields.Datetime.to_string(end_time_dt)
+        else:
+            end_time_str = now_str
+        if standard_price_start_date:
+            standard_price_start_date_str = start_time_str
+        else:
+            standard_price_start_date_str = now_str
+        if standard_price_end_date:
+            standard_price_end_date_str = end_time_str
+        else:
+            standard_price_end_date_str = now_str
+        i = 0
+        sheet.write(i, 0, 'Odoo - Stock Valuation Variation', styles['doc_title'])
+        sheet.set_row(0, 26)
+        i += 1
+        sheet.write(i, 0, 'Start Date: %s' % start_time_str, styles['doc_subtitle'])
+        i += 1
+        sheet.write(i, 0, 'Cost Price Start Date: %s' % standard_price_start_date_str, styles['doc_subtitle'])
+        i += 1
+        sheet.write(i, 0, 'End Date: %s' % end_time_str, styles['doc_subtitle'])
+        i += 1
+        sheet.write(i, 0, 'Cost Price End Date: %s' % standard_price_end_date_str, styles['doc_subtitle'])
+        i += 1
+        sheet.write(i, 0, 'Stock location (children included): %s' % self.location_id.complete_name, styles['doc_subtitle'])
+        if self.categ_ids:
+            i += 1
+            sheet.write(i, 0, 'Product Categories: %s' % ', '.join([categ.display_name for categ in self.categ_ids]), styles['doc_subtitle'])
+        i += 1
+        sheet.write(i, 0, 'Generated on %s by %s' % (now_str, self.env.user.name), styles['regular_small'])
+
+        # TITLE of COLS
+        i += 2
+        for col in cols.values():
+            sheet.write(i, col['pos'], col['title'], styles['col_title'])
+
+        i += 1
+        sheet.write(i, 0, _("TOTALS:"), styles['total_title'])
+        total_row = i
+
+        # LINES
+        if categ_subtotal:
+            categ_ids = categ_id2name.keys()
+        else:
+            categ_ids = [0]
+
+        start_total = end_total = variation_total = 0.0
+        letter_start_qty = cols['start_qty']['pos_letter']
+        letter_in_qty = cols['in_qty']['pos_letter']
+        letter_out_qty = cols['out_qty']['pos_letter']
+        letter_end_qty = cols['end_qty']['pos_letter']
+        letter_start_price = cols['start_standard_price']['pos_letter']
+        letter_end_price = cols['end_standard_price']['pos_letter']
+        letter_start_subtotal = cols['start_subtotal']['pos_letter']
+        letter_end_subtotal = cols['end_subtotal']['pos_letter']
+        letter_variation = cols['variation']['pos_letter']
+        crow = 0
+        lines = res
+        for categ_id in categ_ids:
+            ctotal = 0.0
+            categ_has_line = False
+            if categ_subtotal:
+                # skip a line and save it's position as crow
+                i += 1
+                crow = i
+                lines = filter(lambda x: x['categ_id'] == categ_id, res)
+            for l in lines:
+                i += 1
+                start_total += l['start_subtotal']
+                end_total += l['end_subtotal']
+                variation_total += l['variation']
+                ctotal += l['variation']
+                categ_has_line = True
+                end_qty_formula = '=%s%d+%s%d-%s%d' % (letter_start_qty, i + 1, letter_in_qty, i + 1, letter_out_qty, i + 1)
+                sheet.write_formula(i, cols['end_qty']['pos'], end_qty_formula, styles[cols['end_qty']['style']], l['end_qty'])
+                start_subtotal_formula = '=%s%d*%s%d' % (letter_start_qty, i + 1, letter_start_price, i + 1)
+                sheet.write_formula(i, cols['start_subtotal']['pos'], start_subtotal_formula, styles[cols['start_subtotal']['style']], l['start_subtotal'])
+                end_subtotal_formula = '=%s%d*%s%d' % (letter_end_qty, i + 1, letter_end_price, i + 1)
+                sheet.write_formula(i, cols['end_subtotal']['pos'], end_subtotal_formula, styles[cols['end_subtotal']['style']], l['end_subtotal'])
+                variation_formula = '=%s%d-%s%d' % (letter_end_subtotal, i + 1, letter_start_subtotal, i + 1)
+                sheet.write_formula(i, cols['variation']['pos'], variation_formula, styles[cols['variation']['style']], l['variation'])
+                sheet.write_formula(i, cols['end_subtotal']['pos'], end_subtotal_formula, styles[cols['end_subtotal']['style']], l['end_subtotal'])
+                for col_name, col in cols.items():
+                    if not col.get('formula'):
+                        if col.get('type') == 'date' and l[col_name]:
+                            l[col_name] = fields.Date.from_string(l[col_name])
+                        sheet.write(i, col['pos'], l[col_name], styles[col['style']])
+            if categ_subtotal:
+                if categ_has_line:
+                    sheet.write(crow, 0, categ_id2name[categ_id], styles['categ_title'])
+                    for x in range(cols['categ_subtotal']['pos'] - 1):
+                        sheet.write(crow, x + 1, '', styles['categ_title'])
+
+                    cformula = '=SUM(%s%d:%s%d)' % (letter_variation, crow + 2, letter_variation, i + 1)
+                    sheet.write_formula(crow, cols['categ_subtotal']['pos'], cformula, styles['categ_currency'], float_round(ctotal, precision_rounding=prec_cur_rounding))
+                else:
+                    i -= 1  # go back to skipped line
+
+        # Write total
+        start_total_formula = '=SUM(%s%d:%s%d)' % (letter_start_subtotal, total_row + 2, letter_start_subtotal, i + 1)
+        sheet.write_formula(total_row, cols['start_subtotal']['pos'], start_total_formula, styles['total_currency'], float_round(start_total, precision_rounding=prec_cur_rounding))
+        end_total_formula = '=SUM(%s%d:%s%d)' % (letter_end_subtotal, total_row + 2, letter_end_subtotal, i + 1)
+        sheet.write_formula(total_row, cols['end_subtotal']['pos'], end_total_formula, styles['total_currency'], float_round(end_total, precision_rounding=prec_cur_rounding))
+        variation_total_formula = '=SUM(%s%d:%s%d)' % (letter_variation, total_row + 2, letter_variation, i + 1)
+        sheet.write_formula(total_row, cols['variation']['pos'], variation_total_formula, styles['total_currency'], float_round(variation_total, precision_rounding=prec_cur_rounding))
+
+        workbook.close()
+        logger.debug('End create XLSX workbook')
+        file_data.seek(0)
+        filename = 'Odoo_stock_%s_%s.xlsx' % (
+            start_time_str.replace(' ', '-').replace(':', '_'),
+            end_time_str.replace(' ', '-').replace(':', '_'))
+        export_file_b64 = base64.b64encode(file_data.read())
+        self.write({
+            'export_filename': filename,
+            'export_file': export_file_b64,
+            })
+        action = {
+            'name': _('Stock Variation XLSX'),
+            'type': 'ir.actions.act_url',
+            'url': "web/content/?model=%s&id=%d&filename_field=export_filename&"
+                   "field=export_file&download=true&filename=%s" % (
+                       self._name, self.id, self.export_filename),
+            'target': 'new',
+            }
+        return action
+
+    def _prepare_cols(self):
+        cols = {
+            'default_code': {'width': 18, 'style': 'regular', 'sequence': 10, 'title': _('Product Code')},
+            'product_name': {'width': 40, 'style': 'regular', 'sequence': 20, 'title': _('Product Name')},
+            'uom_name': {'width': 5, 'style': 'regular_small', 'sequence': 30, 'title': _('UoM')},
+            'start_qty': {'width': 8, 'style': 'regular', 'sequence': 40, 'title': _('Start Qty')},
+            'start_standard_price': {'width': 14, 'style': 'regular_price_currency', 'sequence': 50, 'title': _('Start Cost Price')},
+            'start_subtotal': {'width': 16, 'style': 'regular_currency', 'sequence': 60, 'title': _('Start Value'), 'formula': True},
+            'in_qty': {'width': 8, 'style': 'regular', 'sequence': 70, 'title': _('In Qty')},
+            'out_qty': {'width': 8, 'style': 'regular', 'sequence': 80, 'title': _('Out Qty')},
+            'end_qty': {'width': 8, 'style': 'regular', 'sequence': 90, 'title': _('End Qty'), 'formula': True},
+            'end_standard_price': {'width': 14, 'style': 'regular_price_currency', 'sequence': 100, 'title': _('End Cost Price')},
+            'end_subtotal': {'width': 16, 'style': 'regular_currency', 'sequence': 110, 'title': _('End Value'), 'formula': True},
+            'variation': {'width': 16, 'style': 'regular_currency', 'sequence': 120, 'title': _('Variation'), 'formula': True},
+            'categ_subtotal': {'width': 16, 'style': 'regular_currency', 'sequence': 130, 'title': _('Categ Sub-total'), 'formula': True},
+            'categ_name': {'width': 40, 'style': 'regular_small', 'sequence': 140, 'title': _('Product Category')},
+            }
+        return cols

stock_valuation_xlsx/wizard/stock_variation_xlsx_view.xml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright 2021 Akretion France (http://www.akretion.com/)
+  @author: Alexis de Lattre <alexis.delattre@akretion.com>
+  License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+-->
+
+<odoo>
+
+
+<record id="stock_variation_xlsx_form" model="ir.ui.view">
+    <field name="name">stock.variation.xlsx.form</field>
+    <field name="model">stock.variation.xlsx</field>
+    <field name="arch"  type="xml">
+        <form string="Stock variation XLSX">
+            <div name="help">
+                <p>The generated XLSX report has the valuation of stockable products located on the selected stock locations (and their childrens).</p>
+            </div>
+            <group name="setup">
+                <field name="company_id" groups="base.group_multi_company"/>
+                <field name="categ_ids" widget="many2many_tags"/>
+                <field name="warehouse_id"/>
+                <field name="location_id"/>
+                <field name="categ_subtotal" />
+            </group>
+            <group name="start_end">
+                <group name="start" string="Start">
+                    <field name="start_date"/>
+                    <field name="standard_price_start_date_type"/>
+                </group>
+                <group name="end" string="End">
+                    <field name="end_date_type"/>
+                    <field name="end_date" attrs="{'invisible': [('end_date_type', '!=', 'past')], 'required': [('end_date_type', '=', 'past')]}"/>
+                    <field name="standard_price_end_date_type"/>
+                </group>
+            </group>
+            <footer>
+                <button name="generate" type="object" class="btn-primary" string="Generate"/>
+                <button special="cancel" string="Close" class="btn-default"/>
+            </footer>
+        </form>
+    </field>
+</record>
+
+<record id="stock_variation_xlsx_action" model="ir.actions.act_window">
+    <field name="name">Stock Variation XLSX</field>
+    <field name="res_model">stock.variation.xlsx</field>
+    <field name="view_mode">form</field>
+    <field name="target">new</field>
+</record>
+
+<!-- Replace native menu, to avoid user confusion -->
+<menuitem id="stock_variation_xlsx_menu" action="stock_variation_xlsx_action" parent="stock.menu_warehouse_report" sequence="1"/>
+
+</odoo>