Add static legal terms on company for invoice and sale

Add product_supplier_code on purchase.order.line

account_usability/__manifest__.py

@@ -28,6 +28,7 @@
         'views/product.xml',
         'views/res_config_settings.xml',
         'views/res_partner.xml',
+        'views/res_company.xml',
         'views/account_report.xml',
         'wizard/account_invoice_mark_sent_view.xml',
         'wizard/account_group_generate_view.xml',

account_usability/models/__init__.py

@@ -6,4 +6,5 @@ from . import account_journal
 from . import account_move
 from . import account_partial_reconcile
 from . import res_partner
+from . import res_company
 from . import product

account_usability/models/res_company.py

@@ -0,0 +1,21 @@
+# Copyright 2021 Akretion France (https://akretion.com/)
+# @author: Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class ResCompany(models.Model):
+    _inherit = 'res.company'
+
+    # There is a native field invoice_terms which is displayed on res.config.settings
+    # when the ir.config_parameter account.use_invoice_terms is True
+    # But there are several problems with this native field:
+    # - it is copied on the 'narration' field of account.move => we don't want that
+    # - the text block is very small on the form view of res.config.settings
+    # So I decided to have our own field "fixed_invoice_terms"
+    # The native field can still be used when you need to customise some
+    # terms and conditions on each invoice (not very common, but...)
+    # To underline this different with the native field, I prefix it with 'static_'
+    static_invoice_terms = fields.Text(
+        translate=True, string="Legal Terms on Invoice")

account_usability/views/res_company.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright 2021 Akretion (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="view_company_form" model="ir.ui.view">
+    <field name="name">account_usability.res.company.form</field>
+    <field name="model">res.company</field>
+    <field name="inherit_id" ref="base.view_company_form"/>
+    <field name="arch" type="xml">
+        <notebook position="inside">
+            <page string="Legal Terms" name="legal_terms">
+                <group string="Invoice Legal Terms" name="static_invoice_terms">
+                    <field name="static_invoice_terms" nolabel="1"/>
+                </group>
+            </page>
+        </notebook>
+    </field>
+</record>
+
+
+</odoo>