Add static legal terms on company for invoice and sale

Add product_supplier_code on purchase.order.line

sale_usability/models/__init__.py

@@ -2,3 +2,4 @@ from . import sale_order
 from . import account_move
 from . import product_template
 from . import res_partner
+from . import res_company

sale_usability/models/res_company.py

@@ -0,0 +1,13 @@
+# 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'
+
+    # Similar to the field static_invoice_terms in account_usability
+    static_sale_terms = fields.Text(
+        translate=True, string="Legal Terms on Quotation")