diff --git a/Elwig/Dialogs/ManualWeighingDialog.xaml.cs b/Elwig/Dialogs/ManualWeighingDialog.xaml.cs
index b9b5cf2..d0b7cf2 100644
--- a/Elwig/Dialogs/ManualWeighingDialog.xaml.cs
+++ b/Elwig/Dialogs/ManualWeighingDialog.xaml.cs
@@ -9,19 +9,16 @@ namespace Elwig.Dialogs {
         public int Weight = 0;
         public string? Reason = null;
 
-        public ManualWeighingDialog() {
+        public ManualWeighingDialog(string? reason = null) {
             InitializeComponent();
+            ReasonInput.Text = reason;
         }
 
         private void ConfirmButton_Click(object sender, RoutedEventArgs evt) {
             DialogResult = true;
             Weight = int.Parse(WeightInput.Text);
-            Reason = Regex.Replace(ReasonInput.Text, @"\s+", "").Trim();
-            if (Reason == "") {
-                Reason = null;
-            } else if (!Reason.EndsWith(".") || !Reason.EndsWith("!") || !Reason.EndsWith("?")) {
-                Reason += ".";
-            }
+            Reason = Regex.Replace(ReasonInput.Text, @"\s+", " ").Trim();
+            if (Reason == "") Reason = null;
             Close();
         }
 
diff --git a/Elwig/Helpers/Utils.cs b/Elwig/Helpers/Utils.cs
index b90dd04..88125f1 100644
--- a/Elwig/Helpers/Utils.cs
+++ b/Elwig/Helpers/Utils.cs
@@ -219,8 +219,8 @@ namespace Elwig.Helpers {
                 .Sum();
         }
 
-        public static (int, string?)? ShowManualWeighingDialog() {
-            var d = new ManualWeighingDialog();
+        public static (int, string?)? ShowManualWeighingDialog(string? reason = null) {
+            var d = new ManualWeighingDialog(reason);
             return d.ShowDialog() == true ? (d.Weight, d.Reason) : null;
         }
 
diff --git a/Elwig/Windows/AdministrationWindow.cs b/Elwig/Windows/AdministrationWindow.cs
index 1b507a6..2d7aa75 100644
--- a/Elwig/Windows/AdministrationWindow.cs
+++ b/Elwig/Windows/AdministrationWindow.cs
@@ -413,7 +413,7 @@ namespace Elwig.Windows {
             UpdateButtons();
         }
 
-        protected void TextBox_TextChanged(object sender, RoutedEventArgs evt) {
+        protected void TextBox_TextChanged(object sender, RoutedEventArgs? evt) {
             var input = (TextBox)sender;
             if (SenderIsRequired(input) && input.Text.Length == 0) {
                 ValidateInput(input, false);
diff --git a/Elwig/Windows/DeliveryAdminWindow.xaml.cs b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
index 0b96781..5a56e6b 100644
--- a/Elwig/Windows/DeliveryAdminWindow.xaml.cs
+++ b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
@@ -25,6 +25,7 @@ namespace Elwig.Windows {
         private List<string> TextFilter = new();
         private readonly RoutedCommand CtrlF = new();
 
+        private string? LastScaleError = null;
         private string? ManualWeighingReason = null;
         private string? ScaleId = null;
         private string? WeighingId = null;
@@ -147,6 +148,11 @@ namespace Elwig.Windows {
         }
 
         private void InitialInputs() {
+            LastScaleError = null;
+            WeighingId = null;
+            ScaleId = null;
+            ManualWeighingReason = null;
+
             ClearOriginalValues();
             ClearDefaultValues();
 
@@ -651,12 +657,18 @@ namespace Elwig.Windows {
                     ScaleId = null;
                     WeighingId = null;
                 }
-                ManualWeighingReason = null;
-                ManualWeighingInput.IsChecked = false;
+                LastScaleError = null;
             } catch (Exception e) {
+                LastScaleError = e.Message.Split(": ")[^1];
+                WeightInput.Text = "";
+                ScaleId = null;
+                WeighingId = null;
                 MessageBox.Show($"Beim Wiegen ist ein Fehler aufgetreten:\n\n{e.Message}", "Waagenfehler",
                        MessageBoxButton.OK, MessageBoxImage.Error);
             }
+            ManualWeighingReason = null;
+            ManualWeighingInput.IsChecked = false;
+            base.TextBox_TextChanged(WeightInput, null);
             EnableWeighingButtons();
             UpdateButtons();
         }
@@ -885,7 +897,7 @@ namespace Elwig.Windows {
         }
 
         private void WeighingManualButton_Click(object sender, RoutedEventArgs evt) {
-            var res = Utils.ShowManualWeighingDialog();
+            var res = Utils.ShowManualWeighingDialog(LastScaleError);
             if (res == null) return;
             WeightInput.Text = $"{res?.Item1:N0}";
             ManualWeighingInput.IsChecked = true;