diff --git a/party.py b/party.py
index dd33b38cac..d7202fa6b9 100644
--- a/party.py
+++ b/party.py
@@ -12,7 +12,7 @@ try:
         VAT_COUNTRIES.append((country, country))
 except ImportError:
     logging.getLogger('party').warning(
-            'Unable to import vatnumber. VAT number validation disable.')
+            'Unable to import vatnumber. VAT number validation disabled.')
 
 STATES = {
     'readonly': "active == False",
@@ -34,7 +34,7 @@ class Party(ModelSQL, ModelView):
     vat_number = fields.Char('VAT Number', help="Value Added Tax number",
             states=STATES)
     vat_country = fields.Selection(VAT_COUNTRIES, 'VAT Country', states=STATES,
-        help="Setting VAT country will enable verification of the VAT number.",
+        help="Setting VAT country will enable validation of the VAT number.",
         translate=False)
     vat_code = fields.Function('get_vat_code', type='char', string="VAT Code",
             fnct_search='search_vat_code')
@@ -64,10 +64,10 @@ class Party(ModelSQL, ModelView):
              'The code of the party must be unique!')
         ]
         self._constraints += [
-            ('check_vat', 'wrong_vat'),
+            ('check_vat', 'unvalid_vat'),
         ]
         self._error_messages.update({
-            'wrong_vat': 'Wrong VAT number!',
+            'unvalid_vat': 'Unvalid VAT number!',
         })
         self._order.insert(0, ('name', 'ASC'))