diff --git a/models/partner.py b/models/partner.py
index def18c8..007557b 100755
--- a/models/partner.py
+++ b/models/partner.py
@@ -104,7 +104,13 @@ class ResPartner(models.Model):
         
         self._compute_member_status()
     
-
+    @api.constrains('phone')
+    def _onchange_phone(self):
+        pass
+    
+    @api.constrains('mobile')
+    def _onchange_mobile(self):
+        pass
     @api.model
     def create(self, values):
         res = super(ResPartner, self).create(values)