diff --git a/app_common/models/res_partner.py b/app_common/models/res_partner.py
index e0a087bc..43e5eed6 100644
--- a/app_common/models/res_partner.py
+++ b/app_common/models/res_partner.py
@@ -10,4 +10,7 @@ class ResPartner(models.Model):
     def get_related_user_id(self):
         self.ensure_one()
         user = self.env['res.users'].sudo().with_context(active_test=False).search([('partner_id', '=', self.id)], limit=1)
+        if not user and self.commercial_partner_id:
+            user = self.env['res.users'].sudo().with_context(active_test=False).search([('partner_id', '=', self.commercial_partner_id.id)],
+                                                                                       limit=1)
         return user