[MIG] sale_usability to v14 (with up-ports from v10)

sale_usability/models/res_partner.py

@@ -0,0 +1,11 @@
+# Copyright 2017-2020 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 ResPartner(models.Model):
+    _inherit = 'res.partner'
+
+    sale_warn = fields.Selection(tracking=True)