diff --git a/Elwig/Windows/DeliveryAdminWindow.xaml b/Elwig/Windows/DeliveryAdminWindow.xaml
index d060111..8deeefe 100644
--- a/Elwig/Windows/DeliveryAdminWindow.xaml
+++ b/Elwig/Windows/DeliveryAdminWindow.xaml
@@ -518,6 +518,7 @@
                     <ComboBox x:Name="CultivationInput" SelectedItem="{Binding WineCultObj, Mode=TwoWay}" ItemsSource="{Binding WineCultSource, Mode=TwoWay}"
                               Grid.Row="1" Grid.Column="2" Margin="0,40,10,10"
                               DisplayMemberPath="Name"
+                              SelectionChanged="CultivationInput_SelectionChanged"
                               KeyUp="Input_KeyUp"/>
                 </Grid>
             </GroupBox>
diff --git a/Elwig/Windows/DeliveryAdminWindow.xaml.cs b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
index ec03c8a..3182d19 100644
--- a/Elwig/Windows/DeliveryAdminWindow.xaml.cs
+++ b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
@@ -774,12 +774,12 @@ namespace Elwig.Windows {
             MgNrInput.CaretIndex = caret;
         }
 
-        private void MgNrInput_LostFocus(object sender, RoutedEventArgs evt) {
+        private async void MgNrInput_LostFocus(object sender, RoutedEventArgs evt) {
             var valid = InputLostFocus((TextBox)sender, Validator.CheckMgNr);
             ControlUtils.SelectItemWithPk(MemberInput, valid ? ViewModel.MgNr : null);
         }
 
-        private void MemberInput_SelectionChanged(object? sender, SelectionChangedEventArgs? evt) {
+        private async void MemberInput_SelectionChanged(object? sender, SelectionChangedEventArgs? evt) {
             var m = MemberInput.SelectedItem as Member;
             ViewModel.MgNr = m?.MgNr;
             ViewModel.MemberAddress = m?.FullAddress;
@@ -796,6 +796,8 @@ namespace Elwig.Windows {
                 SetDefaultValue(WineKgInput);
                 ComboBox_SelectionChanged(WineKgInput, null);
             }
+            if (IsCreating && Mouse.OverrideCursor == null)
+                await CheckOrganic();
         }
 
         private void EmptyScale() {
@@ -805,6 +807,9 @@ namespace Elwig.Windows {
         }
 
         private async void NewDeliveryPartButton_Click(object sender, RoutedEventArgs evt) {
+            if (!await CheckOrganic(true))
+                return;
+
             FinishButton.IsEnabled = false;
             NewDeliveryPartButton.IsEnabled = false;
             Mouse.OverrideCursor = Cursors.Wait;
@@ -824,7 +829,7 @@ namespace Elwig.Windows {
             } catch (Exception exc) {
                 InteractionService.ShowDbException("Lieferung aktualisieren", exc);
                 FinishButton.IsEnabled = true;
-                SaveButton.IsEnabled = true;
+                NewDeliveryPartButton.IsEnabled = true;
                 Mouse.OverrideCursor = null;
                 DeliveryPartList.IsEnabled = true;
                 return;
@@ -833,14 +838,18 @@ namespace Elwig.Windows {
             EmptyScale();
 
             await EnsureContextRenewed();
-            Mouse.OverrideCursor = null;
             ControlUtils.SelectItemWithPk(DeliveryList, p?.Year, p?.DId);
             DeliveryPartList.SelectedItem = null;
             DeliveryPartList.ScrollIntoView(DeliveryPartList.ItemsSource.Cast<object>().LastOrDefault());
             InitialInputs();
+
+            Mouse.OverrideCursor = null;
         }
 
         private async void FinishButton_Click(object sender, RoutedEventArgs evt) {
+            if (!await CheckOrganic(true))
+                return;
+
             FinishButton.IsEnabled = false;
             NewDeliveryPartButton.IsEnabled = false;
             Mouse.OverrideCursor = Cursors.Wait;
@@ -860,7 +869,7 @@ namespace Elwig.Windows {
             } catch (Exception exc) {
                 InteractionService.ShowDbException("Lieferung aktualisieren", exc);
                 FinishButton.IsEnabled = true;
-                SaveButton.IsEnabled = true;
+                NewDeliveryPartButton.IsEnabled = true;
                 Mouse.OverrideCursor = null;
                 DeliveryPartList.IsEnabled = true;
                 return;
@@ -1038,6 +1047,9 @@ namespace Elwig.Windows {
         }
 
         private async void SaveButton_Click(object? sender, RoutedEventArgs? evt) {
+            if (!await CheckOrganic(true))
+                return;
+
             SaveButton.IsEnabled = false;
             Mouse.OverrideCursor = Cursors.Wait;
 
@@ -1539,5 +1551,43 @@ namespace Elwig.Windows {
             if (MemberInput.SelectedItem is not Member m) return;
             App.FocusMember(m.MgNr);
         }
+
+        private async void CultivationInput_SelectionChanged(object sender, RoutedEventArgs evt) {
+            if (IsCreating && Mouse.OverrideCursor == null)
+                await CheckOrganic();
+        }
+
+        private async Task<bool> CheckOrganic(bool confirm = false) {
+            if (MemberInput.SelectedValue is not Member m || CultivationInput.SelectedItem is not WineCult c) {
+                return true;
+            } else if (c.IsOrganic) {
+                if (m.IsOrganic) {
+                    var valid = true;
+                    if (IsCreating) {
+                        try {
+                            var certs = await OrganicService.GetTracesCertificates(m);
+                            valid = certs.Length > 0 && certs[0].IsValidForWineProduction;
+                        } catch { }
+                    }
+                    if (valid)
+                        return true;
+                    if (confirm) {
+                        return InteractionService.AskConfirmation("Kein gültiges Bio-Zertifikat", "Soll die Bio-Lieferung wirklich gespeichert werden,\nobwohl für das Mitglied kein gültiges Bio-Zertifikat gefunden werden konnte?");
+                    } else {
+                        InteractionService.ShowWarning("Kein gültiges Bio-Zertifikat", "Achtung! Für diesen Bio-Betrieb konnte kein gültiges Bio-Zertifikat gefunden werden!");
+                    }
+                    return false;
+                } else {
+                    if (confirm) {
+                        return InteractionService.AskConfirmation("Kein Bio-Betrieb", "Soll die Bio-Lieferung wirklich gespeichert werden, obwohl das Mitglied keinen Bio-Betrieb hat?");
+                    } else {
+                        InteractionService.ShowWarning("Kein Bio-Betrieb", "Achtung! Bio-Lieferung ohne Bio-Betrieb!");
+                    }
+                    return false;
+                }
+            } else {
+                return true;
+            }
+        }
     }
 }