diff --git a/Elwig/Helpers/Validator.cs b/Elwig/Helpers/Validator.cs
index 5a6054b..7749748 100644
--- a/Elwig/Helpers/Validator.cs
+++ b/Elwig/Helpers/Validator.cs
@@ -589,11 +589,6 @@ namespace Elwig.Helpers {
             return new(true, null);
         }
 
-        public static ValidationResult CheckGstNr(TextBox input, bool required) {
-            // TODO
-            return new(true, "Not implemented yet");
-        }
-
         public static ValidationResult CheckGradatoinOe(TextBox input, bool required) {
             var res = CheckInteger(input, required, 3);
             if (!res.IsValid) {
diff --git a/Elwig/Windows/AreaComAdminWindow.xaml b/Elwig/Windows/AreaComAdminWindow.xaml
index 3cc82fb..684c583 100644
--- a/Elwig/Windows/AreaComAdminWindow.xaml
+++ b/Elwig/Windows/AreaComAdminWindow.xaml
@@ -184,7 +184,7 @@
 
                     <Label Content="Parzelle(n):" Margin="10,70,0,0" Grid.Column="0"/>
                     <TextBox x:Name="GstNrInput" Margin="0,70,10,0" Grid.Column="1" HorizontalAlignment="Stretch"
-                             TextChanged="GstNrInput_TextChanged" LostFocus="GstNrInput_LostFocus"/>
+                             TextChanged="TextBox_TextChanged"/>
 
                     <Label Content="Fläche:" Margin="10,100,0,0" Grid.Column="0"/>
                     <ctrl:UnitTextBox x:Name="AreaInput" Unit="m²" TextChanged="IntegerInput_TextChanged"
diff --git a/Elwig/Windows/AreaComAdminWindow.xaml.cs b/Elwig/Windows/AreaComAdminWindow.xaml.cs
index 0990d19..93ffbe3 100644
--- a/Elwig/Windows/AreaComAdminWindow.xaml.cs
+++ b/Elwig/Windows/AreaComAdminWindow.xaml.cs
@@ -441,13 +441,5 @@ namespace Elwig.Windows {
         private void FbNrInput_LostFocus(object sender, RoutedEventArgs evt) {
             InputLostFocus((TextBox)sender, Validator.CheckFbNr);
         }
-        
-        private void GstNrInput_TextChanged(object sender, RoutedEventArgs evt) {
-            InputTextChanged((TextBox)sender, Validator.CheckGstNr);
-        }
-
-        private void GstNrInput_LostFocus(object sender, RoutedEventArgs evt) {
-            InputLostFocus((TextBox)sender, Validator.CheckGstNr);
-        }
     }
 }