diff --git a/BeWo/View/Detail/CustomerView.xaml.cs b/BeWo/View/Detail/CustomerView.xaml.cs
index 336b8c9c0..59c2b0ee9 100644
--- a/BeWo/View/Detail/CustomerView.xaml.cs
+++ b/BeWo/View/Detail/CustomerView.xaml.cs
@@ -364,6 +364,25 @@ namespace BeWo.View.Detail
             return ViewModel.IsNew ? new[] { UserRightType.CreateAll, UserRightType.CustomerView_Create } : new[] { UserRightType.EditAll, UserRightType.CustomerView_Edit };
         }
 
+        internal override bool DoSaveCheck()
+        {
+            if (this.IsDirty)
+            {
+
+            }
+            var valid = base.DoSaveCheck();
+
+            if (valid)
+            {
+                MessageBox.Show("Nix da", "Änderungen speichern", MessageBoxButton.OK, MessageBoxImage.Exclamation);
+                return false;
+                //ServiceFacade.DoCustomerServiceAsync(s => s.AllowSavingCustomer(cdc), AfterSave);
+            }
+
+            return valid;
+        }
+
+
         protected override void Save()
         {
             if (!_saveInProgress)
@@ -374,27 +393,19 @@ namespace BeWo.View.Detail
                 //var lDataContract = ViewModel.CommitToDataContract();
                 try
                 {
+                    
                     long oid = 0;
                     IsDoneWithInsertOrUpdate = false;
 
                     if (ViewModel.IsNew)
                     {
-                        oid =  ServiceFacade.DoCustomerServiceSync(s => s.InsertNewCustomer(cdc));
+                        ServiceFacade.DoCustomerServiceAsync(s => s.InsertNewCustomer(cdc), AfterSave);
                     }
                     else
                     {
-                        IsDoneWithInsertOrUpdate = false;
-                        oid = ServiceFacade.DoCustomerServiceSync(s => s.UpdateCustomer(cdc));
-                    }
-
-                    if (oid > 0)
-                    {
-                        Cache.GetInstance().ClearSupportConceptTree();
-                        Cache.GetInstance().ClearCustomers();
-                        BeWoApp.MainControl.ResetView(UIContext.Customer);
-
-                        ReloadViewModel(oid);
+                        ServiceFacade.DoCustomerServiceAsync(s => s.UpdateCustomer(cdc), AfterSave);
                     }
+                    
                 }
                 catch (FaultException<BeWoFault>)
                 {
@@ -473,6 +484,18 @@ namespace BeWo.View.Detail
             c.ItemsSource = _PossibleDiagnosis;
         }
 
+        private void AfterSave(long oid)
+        {
+            if (oid > 0)
+            {
+                Cache.GetInstance().ClearSupportConceptTree();
+                Cache.GetInstance().ClearCustomers();
+                BeWoApp.MainControl.ResetView(UIContext.Customer);
+
+                ReloadViewModel(oid);
+            }
+        }
+
         private void ReloadViewModel(long pCustomerOID)
         {
             // reload to update version information and oid