Port may only be changed if the shipcall is created

src/BreCalClient/EditShipcallControl.xaml.cs

@@ -42,6 +42,8 @@ namespace BreCalClient
 
         public ShipApi? ShipApi { get; set; }
 
+        public bool IsCreate { get; set; } = false;
+
         #endregion
 
         #region Event handler
@@ -395,6 +397,7 @@ namespace BreCalClient
             this.datePickerETD.IsEnabled = isAgency || isBsmd;
 
             this.labelBSMDGranted.Visibility = editRightGrantedForBSMD ? Visibility.Visible : Visibility.Hidden;
+            this.comboBoxHarbour.IsEnabled = this.IsCreate;
 
             this.comboBoxCategories_SelectionChanged(null, null);
         }

src/BreCalClient/MainWindow.xaml.cs

@@ -247,7 +247,8 @@ namespace BreCalClient
             EditShipcallControl esc = new()
             {
                 ShipEditingEnabled = App.Participant.IsTypeFlagSet(Extensions.ParticipantType.BSMD),
-                ShipApi = _shipApi
+                ShipApi = _shipApi,
+                IsCreate = true
             };
             if (model != null)
                 esc.ShipcallModel = model;