diff --git a/ext/custom-addons/dp_custom/models/res_partner.py b/ext/custom-addons/dp_custom/models/res_partner.py
index 5f90dd0f..b99ecebc 100644
--- a/ext/custom-addons/dp_custom/models/res_partner.py
+++ b/ext/custom-addons/dp_custom/models/res_partner.py
@@ -60,8 +60,7 @@ class Partner(models.Model):
 
     _sql_constraints = [
         ('ref_uniq', 'unique(ref)', 'Die Interne Referenz muss eindeutig sein'),
-        ('portal_id_uniq', 'unique(portal_id)', 'Die Portal-ID muss eindeutig sein'),
-        ('is_company_vat_uniq', 'unique(is_company, vat)', 'Die USt. ID muss eindeutig sein')
+        ('portal_id_uniq', 'unique(portal_id)', 'Die Portal-ID muss eindeutig sein')
     ]
 
     @api.model