1 files changed, 27 insertions, 0 deletions
diff --git a/addons/account/models/res_users.py b/addons/account/models/res_users.py
new file mode 100644
index 00000000..0cf9d85c
--- /dev/null
+++ b/addons/account/models/res_users.py
@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, models, _
+from odoo.exceptions import ValidationError
+
+
+class Users(models.Model):
+    _inherit = "res.users"
+
+    @api.constrains('groups_id')
+    def _check_one_user_type(self):
+        super(Users, self)._check_one_user_type()
+
+        g1 = self.env.ref('account.group_show_line_subtotals_tax_included', False)
+        g2 = self.env.ref('account.group_show_line_subtotals_tax_excluded', False)
+
+        if not g1 or not g2:
+            # A user cannot be in a non-existant group
+            return
+
+        for user in self:
+            if user._has_multiple_groups([g1.id, g2.id]):
+                raise ValidationError(_("A user cannot have both Tax B2B and Tax B2C.\n"
+                                        "You should go in General Settings, and choose to display Product Prices\n"
+                                        "either in 'Tax-Included' or in 'Tax-Excluded' mode\n"
+                                        "(or switch twice the mode if you are already in the desired one)."))