diff --git a/account_usability/account.py b/account_usability/account.py
index a5faf07..82d539c 100644
--- a/account_usability/account.py
+++ b/account_usability/account.py
@@ -6,6 +6,7 @@
 from odoo import models, fields, api, _
 from odoo.tools import float_compare, float_is_zero
 from odoo.exceptions import UserError
+from itertools import groupby
 
 
 class AccountInvoice(models.Model):
@@ -56,6 +57,48 @@ class AccountInvoice(models.Model):
     #    return res
 
 
+    # for report
+    @api.multi
+    def py3o_lines_layout(self):
+        self.ensure_one()
+        res1 = []
+        # [
+        #    {'categ': categ(6), 'lines': [l1, l2], 'subtotal': 23.32},
+        #    {'categ': categ(1), 'lines': [l3, l4, l5], 'subtotal': 12.42},
+        # ]
+        for categ, lines in\
+                groupby(self.invoice_line_ids, lambda l: l.layout_category_id):
+            entry = {'lines': [], 'categ': categ}
+            if categ.subtotal:
+                entry['subtotal'] = 0.0
+            for line in lines:
+                entry['lines'].append(line)
+                if 'subtotal' in entry:
+                    entry['subtotal'] += line.price_subtotal
+            res1.append(entry)
+        res2 = []
+        if len(res1) == 1 and not res1[0]['categ']:
+            # No category at all
+            for l in res1[0]['lines']:
+                res2.append({'line': l})
+        else:
+            # TODO : gérer qd il n'y a pas de categ
+            for ldict in res1:
+                res2.append({'categ': ldict['categ']})
+                for line in ldict['lines']:
+                    res2.append({'line': line})
+                if 'subtotal' in ldict:
+                    res2.append({'subtotal': ldict['subtotal']})
+        # res2:
+        # [
+        #    {'categ': categ(1)},
+        #    {'line': invoice_line(2)},
+        #    {'line': invoice_line(3)},
+        #    {'subtotal': 8932.23},
+        # ]
+        return res2
+
+
 class AccountInvoiceLine(models.Model):
     _inherit = 'account.invoice.line'
 
diff --git a/base_usability/__init__.py b/base_usability/__init__.py
index 32f4452..767083b 100644
--- a/base_usability/__init__.py
+++ b/base_usability/__init__.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from . import partner
+from . import company
 from . import mail
 from . import misc
 from . import report_sxw
diff --git a/base_usability/company.py b/base_usability/company.py
new file mode 100644
index 0000000..2cb4206
--- /dev/null
+++ b/base_usability/company.py
@@ -0,0 +1,81 @@
+# -*- coding: utf-8 -*-
+# © 2015-2016 Akretion (Alexis de Lattre <alexis.delattre@akretion.com>)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import models, api, _
+
+
+class ResCompany(models.Model):
+    _inherit = 'res.company'
+
+    @api.model
+    def generate_line(self, fields, options, icon=True, separator=' - '):
+        assert fields
+        assert options
+        content = []
+        for field in fields:
+            value = False
+            if isinstance(field, tuple) and len(field) == 2:
+                value = field[0]
+                label = field[1]
+                uicon = False
+            elif isinstance(field, (str, unicode)) and field in options:
+                value = options[field]['value']
+                label = options[field].get('label')
+                uicon = options[field].get('icon')
+            if value:
+                prefix = icon and uicon or label
+                if prefix:
+                    content.append(u'%s %s' % (prefix, value))
+                else:
+                    content.append(value)
+        line = separator.join(content)
+        return line
+
+    @api.multi
+    def _prepare_header_options(self):
+        self.ensure_one()
+        options = {
+            'phone': {
+                'value': self.phone,
+                # http://www.fileformat.info/info/unicode/char/1f4de/index.htm
+                'icon': u'\U0001F4DE',
+                'label': _('Tel:')},
+            'fax': {
+                'value': self.fax,
+                # http://www.fileformat.info/info/unicode/char/1f5b7/index.htm
+                'icon': u'\U0001F5B7',
+                'label': _('Fax:')},
+            'email': {
+                'value': self.email,
+                # http://www.fileformat.info/info/unicode/char/2709/index.htm
+                'icon': u'\u2709',
+                'label': _('E-mail:')},
+            'website': {
+                'value': self.website,
+                'icon': u'\U0001f310',
+                'label': _('Website:')},
+            'vat': {
+                'value': self.vat,
+                'label': _('TVA :')},  # TODO translate
+            }
+        return options
+
+    # for reports
+    @api.multi
+    def _display_report_header(
+            self, line_details=[['phone', 'fax', 'website'], ['vat']],
+            icon=True, line_separator=' - '):
+        self.ensure_one()
+        res = u''
+        address = self.partner_id._display_address(without_company=True)
+        address = address.replace('\n', u' - ')
+        line1 = u'%s - %s' % (self.name, address)
+        lines = [line1]
+        options = self._prepare_header_options()
+        for details in line_details:
+            line = self.generate_line(
+                details, options, icon=icon, separator=line_separator)
+            lines.append(line)
+        res = '\n'.join(lines)
+        return res
diff --git a/sale_usability/sale.py b/sale_usability/sale.py
index e2c5e02..65315aa 100644
--- a/sale_usability/sale.py
+++ b/sale_usability/sale.py
@@ -43,7 +43,8 @@ class SaleOrder(models.Model):
         #    {'categ': categ(6), 'lines': [l1, l2], 'subtotal': 23.32},
         #    {'categ': categ(1), 'lines': [l3, l4, l5], 'subtotal': 12.42},
         # ]
-        for categ, lines in groupby(self.order_line, lambda l: l.layout_category_id):
+        for categ, lines in\
+                groupby(self.order_line, lambda l: l.layout_category_id):
             entry = {'lines': [], 'categ': categ}
             if categ.subtotal:
                 entry['subtotal'] = 0.0
@@ -61,8 +62,8 @@ class SaleOrder(models.Model):
             # TODO : gérer qd il n'y a pas de categ
             for ldict in res1:
                 res2.append({'categ': ldict['categ']})
-                for soline in ldict['lines']:
-                    res2.append({'line': soline})
+                for line in ldict['lines']:
+                    res2.append({'line': line})
                 if 'subtotal' in ldict:
                     res2.append({'subtotal': ldict['subtotal']})
         # res2: