diff --git a/ext/custom-addons/dp_custom/models/res_partner.py b/ext/custom-addons/dp_custom/models/res_partner.py
index af66de18..3043dd97 100644
--- a/ext/custom-addons/dp_custom/models/res_partner.py
+++ b/ext/custom-addons/dp_custom/models/res_partner.py
@@ -192,6 +192,7 @@ class Partner(models.Model):
                 continue
             partners = self.search([('is_company', '=', True),
                                     ('vat', '=', self.vat),
+                                    ('company_id', '=', self.company_id.id),
                                     ('id', '!=', self.id)])
             if partners:
                 raise ValidationError(_("UID-Exists: Es sind bereits folgende Unternehmen mit der selben USt. ID "