diff --git a/base_vat_optional_vies/models/res_partner.py b/base_vat_optional_vies/models/res_partner.py
index 1cf0a3bc..7e1800d1 100644
--- a/base_vat_optional_vies/models/res_partner.py
+++ b/base_vat_optional_vies/models/res_partner.py
@@ -34,7 +34,7 @@ class ResPartner(models.Model):
             return self.simple_vat_check(country_code, vat_number)
         return res
 
-    @api.constrains('vat', 'commercial_partner.country_id')
+    @api.constrains('vat')
     def check_vat(self):
         for partner in self:
             partner = partner.with_context(vat_partner=partner)