diff --git a/addons/account/models/partner.py b/addons/account/models/partner.py
index 0c7c5705b8e..1914a270cf3 100644
--- a/addons/account/models/partner.py
+++ b/addons/account/models/partner.py
@@ -48,7 +48,7 @@ class AccountFiscalPosition(models.Model):
     @api.constrains('zip_from', 'zip_to')
     def _check_zip(self):
         for position in self:
-            if self.zip_from and self.zip_to and position.zip_from > position.zip_to:
+            if position.zip_from and position.zip_to and position.zip_from > position.zip_to:
                 raise ValidationError(_('Invalid "Zip Range", please configure it properly.'))
 
     def map_tax(self, taxes, product=None, partner=None):