diff --git a/ext/custom-addons/dp_custom/models/account.py b/ext/custom-addons/dp_custom/models/account.py
index 5c5f09cb..d207044d 100644
--- a/ext/custom-addons/dp_custom/models/account.py
+++ b/ext/custom-addons/dp_custom/models/account.py
@@ -20,6 +20,7 @@
 ##############################################################################
 from odoo import api, fields, models, _
 from odoo.exceptions import UserError
+from odoo.exceptions import ValidationError
 
 
 class AccountInvoiceLine(models.Model):
@@ -87,11 +88,11 @@ class AccountInvoice(models.Model):
     def onchange_partner_shipping_id(self):
 #        res = super(AccountInvoice, self).onchange_partner_shipping_id()
         if not self.env.user.has_group('dp_custom.group_allow_third_country_sale'):
-            if self.partner_invoice_id.country_id != self.partner_shipping_id.country_id:
+            if self.partner_id.country_id != self.partner_shipping_id.country_id:
                 message = _('Rechnungs- und Lieferland passen nicht zusammen: %s <-> %s!') % \
-                          (self.partner_invoice_id.country_id.name, self.partner_shipping_id.country_id.name)
+                          (self.partner_id.country_id.name, self.partner_shipping_id.country_id.name)
 
-                raise Warning(_(message))
+                raise ValidationError(message)
 
     @api.multi
     def action_invoice_open(self):