From 8ba051198f16d67f5a59efb52e5e6b43a7b2168d Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Mon, 14 Sep 2026 10:32:14 +0200
Subject: [PATCH] DeliveryAdminWindow: Add button to correct tare

---
 Elwig/Dialogs/ManualWeighingDialog.xaml    |  9 ++--
 Elwig/Dialogs/ManualWeighingDialog.xaml.cs |  4 +-
 Elwig/Dialogs/TareCorrectionDialog.xaml    | 55 ++++++++++++++++++++++
 Elwig/Dialogs/TareCorrectionDialog.xaml.cs | 36 ++++++++++++++
 Elwig/Documents/DeliveryNote.cs            | 12 ++++-
 Elwig/Helpers/Utils.cs                     |  5 ++
 Elwig/Models/Entities/DeliveryPart.cs      |  5 +-
 Elwig/Services/DeliveryService.cs          | 13 ++++-
 Elwig/ViewModels/DeliveryAdminViewModel.cs |  8 ++++
 Elwig/Windows/DeliveryAdminWindow.xaml     | 22 ++++++---
 Elwig/Windows/DeliveryAdminWindow.xaml.cs  | 36 ++++++++++++++
 11 files changed, 185 insertions(+), 20 deletions(-)
 create mode 100644 Elwig/Dialogs/TareCorrectionDialog.xaml
 create mode 100644 Elwig/Dialogs/TareCorrectionDialog.xaml.cs

diff --git a/Elwig/Dialogs/ManualWeighingDialog.xaml b/Elwig/Dialogs/ManualWeighingDialog.xaml
index 94bd0a4..c41fb1d 100644
--- a/Elwig/Dialogs/ManualWeighingDialog.xaml
+++ b/Elwig/Dialogs/ManualWeighingDialog.xaml
@@ -4,6 +4,7 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:Elwig.Dialogs"
+        xmlns:ctrl="clr-namespace:Elwig.Controls"
         ResizeMode="NoResize" ShowInTaskbar="False" Topmost="True"
         WindowStartupLocation="CenterOwner"
         FocusManager.FocusedElement="{Binding ElementName=WeightInput}"
@@ -37,11 +38,9 @@
         </Grid.ColumnDefinitions>
 
         <Label Content="Gewicht:" Margin="10,20,10,10"/>
-        <Grid Grid.Column="1" Width="70" Height="25" Margin="0,20,10,10" HorizontalAlignment="Left" VerticalAlignment="Top">
-            <TextBox x:Name="WeightInput" TextAlignment="Right" Padding="2,2,17,2"
-                     TextChanged="WeightInput_TextChanged"/>
-            <Label Content="kg" Margin="0,4,3,0" HorizontalAlignment="Right" FontSize="10" Padding="2,4,2,4"/>
-        </Grid>
+        <ctrl:UnitTextBox x:Name="WeightInput" Grid.Column="1" Width="62" Height="25" Unit="kg"
+                          Margin="0,20,10,10" HorizontalAlignment="Left" VerticalAlignment="Top" FontSize="14" Padding="2"
+                          TextChanged="WeightInput_TextChanged"/>
 
         <Label Content="Grund:" Margin="10,50,10,10"/>
         <TextBox x:Name="ReasonInput" Grid.Column="1" Margin="0,50,10,10"
diff --git a/Elwig/Dialogs/ManualWeighingDialog.xaml.cs b/Elwig/Dialogs/ManualWeighingDialog.xaml.cs
index d0b7cf2..94bc33e 100644
--- a/Elwig/Dialogs/ManualWeighingDialog.xaml.cs
+++ b/Elwig/Dialogs/ManualWeighingDialog.xaml.cs
@@ -6,8 +6,8 @@ using System.Windows.Controls;
 namespace Elwig.Dialogs {
     public partial class ManualWeighingDialog : Window {
 
-        public int Weight = 0;
-        public string? Reason = null;
+        public int Weight { get; private set; }
+        public string? Reason { get; private set; }
 
         public ManualWeighingDialog(string? reason = null) {
             InitializeComponent();
diff --git a/Elwig/Dialogs/TareCorrectionDialog.xaml b/Elwig/Dialogs/TareCorrectionDialog.xaml
new file mode 100644
index 0000000..d75a3a1
--- /dev/null
+++ b/Elwig/Dialogs/TareCorrectionDialog.xaml
@@ -0,0 +1,55 @@
+<Window x:Class="Elwig.Dialogs.TareCorrectionDialog"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Elwig.Dialogs"
+        xmlns:ctrl="clr-namespace:Elwig.Controls"
+        ResizeMode="NoResize" ShowInTaskbar="False" Topmost="True"
+        WindowStartupLocation="CenterOwner"
+        FocusManager.FocusedElement="{Binding ElementName=TargetTareInput}"
+        Title="Tara korrigieren" Height="170" Width="300">
+    <Window.Resources>
+        <Style TargetType="Label">
+            <Setter Property="HorizontalAlignment" Value="Left"/>
+            <Setter Property="VerticalAlignment" Value="Top"/>
+            <Setter Property="Padding" Value="2,4,2,4"/>
+            <Setter Property="Height" Value="25"/>
+        </Style>
+        <Style TargetType="TextBox">
+            <Setter Property="HorizontalAlignment" Value="Stretch"/>
+            <Setter Property="VerticalAlignment" Value="Top"/>
+            <Setter Property="FontSize" Value="14"/>
+            <Setter Property="Padding" Value="2"/>
+            <Setter Property="Height" Value="25"/>
+            <Setter Property="TextWrapping" Value="NoWrap"/>
+        </Style>
+        <Style TargetType="Button">
+            <Setter Property="HorizontalAlignment" Value="Right"/>
+            <Setter Property="VerticalAlignment" Value="Bottom"/>
+            <Setter Property="Width" Value="100"/>
+            <Setter Property="Height" Value="25"/>
+        </Style>
+    </Window.Resources>
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="*"/>
+            <ColumnDefinition Width="70"/>
+            <ColumnDefinition Width="3*"/>
+        </Grid.ColumnDefinitions>
+
+        <Label Content="Ist-Tara:" Margin="10,20,0,10" Grid.Column="1"/>
+        <ctrl:UnitTextBox x:Name="ActualTareInput" Grid.Column="2" Width="56" Height="25" Unit="kg" IsReadOnly="True"
+                          Margin="0,20,10,10" HorizontalAlignment="Left" VerticalAlignment="Top" FontSize="14" Padding="2"
+                          TextChanged="TareInput_TextChanged"/>
+
+        <Label Content="Soll-Tara:" Margin="10,50,0,10" Grid.Column="1"/>
+        <ctrl:UnitTextBox x:Name="TargetTareInput" Grid.Column="2" Width="56" Height="25" Unit="kg"
+                          Margin="0,50,10,10" HorizontalAlignment="Left" VerticalAlignment="Top" FontSize="14" Padding="2"
+                          TextChanged="TareInput_TextChanged"/>
+
+        <Button x:Name="ConfirmButton" Content="Bestätigen" Margin="10,10,115,10" Grid.ColumnSpan="3" IsEnabled="False" IsDefault="True"
+                Click="ConfirmButton_Click"/>
+        <Button x:Name="CancelButton" Content="Abbrechen" Margin="10,10,10,10" Grid.ColumnSpan="3" IsCancel="True"/>
+    </Grid>
+</Window>
diff --git a/Elwig/Dialogs/TareCorrectionDialog.xaml.cs b/Elwig/Dialogs/TareCorrectionDialog.xaml.cs
new file mode 100644
index 0000000..e56532d
--- /dev/null
+++ b/Elwig/Dialogs/TareCorrectionDialog.xaml.cs
@@ -0,0 +1,36 @@
+using Elwig.Helpers;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace Elwig.Dialogs {
+    public partial class TareCorrectionDialog : Window {
+
+        public int ActualTare { get; private set; }
+        public int TargetTare { get; private set; }
+
+        public TareCorrectionDialog(int actualTare, int? targetTare = null) {
+            InitializeComponent();
+            ActualTare = actualTare;
+            TargetTare = targetTare ?? actualTare;
+            ActualTareInput.Text = ActualTare.ToString();
+            TargetTareInput.Text = TargetTare.ToString();
+            TargetTareInput.SelectAll();
+        }
+
+        private void ConfirmButton_Click(object sender, RoutedEventArgs evt) {
+            DialogResult = true;
+            TargetTare = int.Parse(TargetTareInput.Text);
+            Close();
+        }
+
+        private void UpdateButtons() {
+            ConfirmButton.IsEnabled = TargetTareInput.Text.Length > 0;
+        }
+
+        private void TareInput_TextChanged(object sender, TextChangedEventArgs evt) {
+            if (sender is not TextBox b) return;
+            Validator.CheckInteger(b, true, 4);
+            UpdateButtons();
+        }
+    }
+}
diff --git a/Elwig/Documents/DeliveryNote.cs b/Elwig/Documents/DeliveryNote.cs
index 1723543..e4a7885 100644
--- a/Elwig/Documents/DeliveryNote.cs
+++ b/Elwig/Documents/DeliveryNote.cs
@@ -196,9 +196,17 @@ namespace Elwig.Documents {
                             .Add(Italic("Brutto:"))
                             .Add(Normal($" {info.Gross:N0} kg \u2013 "))
                             .Add(Italic("Tara:"))
-                            .Add(Normal($" {info.Tare:N0} kg \u2013 "))
+                            .Add(Normal($" {info.Tare:N0} kg "));
+                        if (info.TareCorrection != null && info.TareCorrection != 0)
+                            weighing.Add(Bold($"(Korr.: {Utils.GetSign(info.TareCorrection.Value)}{Math.Abs(info.TareCorrection.Value)} kg)")).Add(" ");
+                        weighing
+                            .Add(Normal("\u2013 "))
                             .Add(Italic("Netto:"))
-                            .Add(Normal($" {info.Net:N0} kg \u2013 "))
+                            .Add(Normal($" {info.Net:N0} kg "));
+                        if (info.TareCorrection != null && info.TareCorrection != 0)
+                            weighing.Add(Normal($"({Utils.GetSign(-info.TareCorrection.Value)}{Math.Abs(info.TareCorrection.Value)} kg) "));
+                        weighing
+                            .Add(Normal("\u2013 "))
                             .Add(Italic(part.IsNetWeight ? "gerebelt gewogen" : "nicht gerebelt gewogen"));
                     } else {
                         weighing.Add(" ")
diff --git a/Elwig/Helpers/Utils.cs b/Elwig/Helpers/Utils.cs
index 904aad3..4aaab1a 100644
--- a/Elwig/Helpers/Utils.cs
+++ b/Elwig/Helpers/Utils.cs
@@ -303,6 +303,11 @@ namespace Elwig.Helpers {
             return d.ShowDialog() == true ? (d.Weight, d.Reason) : null;
         }
 
+        public static int? ShowTareCorrectionDialog(int actualTare, int? targetTare = null) {
+            var d = new TareCorrectionDialog(actualTare, targetTare);
+            return d.ShowDialog() == true ? d.TargetTare - d.ActualTare : null;
+        }
+
         public static (string?, int[])? ShowDeliverySplittingDialog(Delivery delivery) {
             var d = new DeliverySplittingDialog(delivery);
             return d.ShowDialog() == true ? (d.MgNr?.ToString() ?? d.LsNr, d.Weights ?? []) : null;
diff --git a/Elwig/Models/Entities/DeliveryPart.cs b/Elwig/Models/Entities/DeliveryPart.cs
index fc6379d..7febef1 100644
--- a/Elwig/Models/Entities/DeliveryPart.cs
+++ b/Elwig/Models/Entities/DeliveryPart.cs
@@ -124,7 +124,7 @@ namespace Elwig.Models.Entities {
         [Column("weighing_data")]
         public string? WeighingData { get; set; }
         [NotMapped]
-        public (string? ScaleId, string? Id, int? Gross, int? Tare, int? Net, DateOnly? Date, TimeOnly? Time) WeighingInfo {
+        public (string? ScaleId, string? Id, int? Gross, int? Tare, int? TareCorrection, int? Net, DateOnly? Date, TimeOnly? Time) WeighingInfo {
             get {
                 try {
                     var obj = JsonNode.Parse(WeighingData!)!.AsObject();
@@ -133,12 +133,13 @@ namespace Elwig.Models.Entities {
                         obj["id"]?.AsValue().GetValue<string>(),
                         obj["gross_weight"]?.AsValue().GetValue<int>(),
                         obj["tare_weight"]?.AsValue().GetValue<int>(),
+                        obj["tare_correction"]?.AsValue().GetValue<int>(),
                         obj["net_weight"]?.AsValue().GetValue<int>(),
                         DateOnly.TryParseExact(obj["date"]?.AsValue().GetValue<string>(), "yyyy-MM-dd", out var d) ? d : null,
                         TimeOnly.TryParseExact(obj["time"]?.AsValue().GetValue<string>(), ["HH:mm:ss", "HH:mm"], out var t) ? t : null
                     );
                 } catch {
-                    return (null, null, null, null, null, null, null);
+                    return (null, null, null, null, null, null, null, null);
                 }
             }
         }
diff --git a/Elwig/Services/DeliveryService.cs b/Elwig/Services/DeliveryService.cs
index 258da89..6471c64 100644
--- a/Elwig/Services/DeliveryService.cs
+++ b/Elwig/Services/DeliveryService.cs
@@ -35,8 +35,13 @@ namespace Elwig.Services {
 
             vm.SortId = "";
             vm.GradationKmwString = "";
-            vm.WeightString = "";
+
+            vm.Weight = null;
+            vm.ActualTare = 0;
+            vm.TargetTare = null;
+            vm.Tare = null;
             vm.IsManualWeighing = false;
+
             vm.PartComment = "";
             vm.TemperatureString = "";
             vm.AcidString = "";
@@ -51,7 +56,11 @@ namespace Elwig.Services {
             vm.WineKg = ControlUtils.GetItemFromSourceWithPk(vm.WineKgSource, p.KgNr) as AT_Kg;
             vm.WineRd = ControlUtils.GetItemFromSourceWithPk(vm.WineRdSource, p.KgNr, p.RdNr) as WbRd;
             vm.WineOrigin = ControlUtils.GetItemFromSourceWithPk(vm.WineOriginSource, p.HkId) as WineOrigin;
-            vm.WeightString = $"{p.Weight:N0}";
+
+            vm.Weight = p.Weight;
+            vm.ActualTare = p.WeighingInfo.Tare ?? 0;
+            vm.TargetTare = vm.ActualTare + p.WeighingInfo.TareCorrection;
+            vm.Tare = vm.ActualTare != 0 ? vm.TargetTare ?? vm.ActualTare : null;
             vm.IsManualWeighing = p.IsManualWeighing;
             vm.IsNetWeight = p.IsNetWeight;
 
diff --git a/Elwig/ViewModels/DeliveryAdminViewModel.cs b/Elwig/ViewModels/DeliveryAdminViewModel.cs
index 9d41b87..f68ae8c 100644
--- a/Elwig/ViewModels/DeliveryAdminViewModel.cs
+++ b/Elwig/ViewModels/DeliveryAdminViewModel.cs
@@ -120,6 +120,14 @@ namespace Elwig.ViewModels {
             set => WeightString = $"{value:N0}";
         }
         [ObservableProperty]
+        private string? _tareString = "-";
+        public int? Tare {
+            get => int.TryParse(TareString?.Replace(Utils.GroupSeparator, "").Replace(" kg", ""), out var w) ? w : null;
+            set => TareString = value == null ? "-" : $"{value:N0} kg{(TargetTare != null ? "*" : "")}";
+        }
+        public int ActualTare;
+        public int? TargetTare;
+        [ObservableProperty]
         private bool _isManualWeighing;
         [ObservableProperty]
         private bool? _isNetWeightValue = false;
diff --git a/Elwig/Windows/DeliveryAdminWindow.xaml b/Elwig/Windows/DeliveryAdminWindow.xaml
index 87e59ae..d060111 100644
--- a/Elwig/Windows/DeliveryAdminWindow.xaml
+++ b/Elwig/Windows/DeliveryAdminWindow.xaml
@@ -398,7 +398,8 @@
         <Grid Grid.Row="1" Grid.Column="2">
             <Grid.RowDefinitions>
                 <RowDefinition Height="0.625*"/>
-                <RowDefinition Height="0.875*"/>
+                <RowDefinition Height="0.8125*"/>
+                <RowDefinition Height="0.0625*"/>
                 <RowDefinition Height="0.875*"/>
                 <RowDefinition Height="0.25*"/>
                 <RowDefinition Height="*"/>
@@ -434,7 +435,7 @@
                 </Grid>
             </GroupBox>
 
-            <GroupBox Header="Lieferung" Grid.Column="0" Grid.Row="1" Grid.RowSpan="3" Margin="5,5,5,5">
+            <GroupBox Header="Lieferung" Grid.Column="0" Grid.Row="1" Grid.RowSpan="4" Margin="5,5,5,5">
                 <Grid>
                     <Grid.ColumnDefinitions>
                         <ColumnDefinition Width="100"/>
@@ -553,7 +554,7 @@
                 </Grid>
             </GroupBox>
 
-            <GroupBox Header="Menge" Grid.Column="1" Grid.Row="2" Margin="5,5,5,5">
+            <GroupBox Header="Menge" Grid.Column="1" Grid.Row="2" Grid.RowSpan="2" Margin="5,5,5,5">
                 <Grid>
                     <Grid.ColumnDefinitions>
                         <ColumnDefinition Width="70"/>
@@ -565,16 +566,23 @@
                                       TextChanged="WeightInput_TextChanged"
                                       Grid.Column="1" Width="70" Margin="0,10,10,10" HorizontalAlignment="Left" VerticalAlignment="Top"/>
 
+                    <Label Content="Tara:" Margin="10,40,10,10"/>
+                    <TextBlock x:Name="Tare" Text="{Binding TareString}" Width="40"
+                               Grid.Column="1" Margin="30,44,10,10" TextAlignment="Center" HorizontalAlignment="Left" VerticalAlignment="Top"/>
+
                     <CheckBox x:Name="ManualWeighingInput" IsChecked="{Binding IsManualWeighing, Mode=TwoWay}"
                               Content="Handwiegung" IsEnabled="False"
-                              VerticalAlignment="Top" HorizontalAlignment="Left" Margin="10,45,10,10" Grid.Column="0" Grid.ColumnSpan="2"
+                              VerticalAlignment="Top" HorizontalAlignment="Left" Margin="10,75,10,10" Grid.Column="0" Grid.ColumnSpan="2"
                               Checked="CheckBox_Changed" Unchecked="CheckBox_Changed"/>
 
                     <CheckBox x:Name="GerebeltGewogenInput" IsChecked="{Binding IsNetWeightValue, Mode=TwoWay}"
                               Content="Gerebelt gewogen" IsThreeState="True"
-                              VerticalAlignment="Top" HorizontalAlignment="Left" Margin="10,75,10,10" Grid.Column="0" Grid.ColumnSpan="2"
+                              VerticalAlignment="Top" HorizontalAlignment="Left" Margin="10,100,10,10" Grid.Column="0" Grid.ColumnSpan="2"
                               Checked="GerebeltGewogenInput_Changed" Unchecked="GerebeltGewogenInput_Changed" Indeterminate="GerebeltGewogenInput_Changed"/>
 
+                    <Button x:Name="CorrectTareButton" Content="Tara korrigieren" Width="120" Visibility="Hidden"
+                            Click="CorrectTareButton_Click"
+                            VerticalAlignment="Top" HorizontalAlignment="Right" Margin="10,10,10,10" Grid.Column="2"/>
                     <Button x:Name="WeighingAButton" Content="Wiegen A" Width="120"
                             Click="WeighingButton_Click"
                             VerticalAlignment="Top" HorizontalAlignment="Right" Margin="10,10,10,10" Grid.Column="2"/>
@@ -593,7 +601,7 @@
                 </Grid>
             </GroupBox>
 
-            <GroupBox Header="Sonstiges" Grid.Column="1" Grid.Row="3" Grid.RowSpan="2" Margin="5,5,5,10">
+            <GroupBox Header="Sonstiges" Grid.Column="1" Grid.Row="4" Grid.RowSpan="2" Margin="5,5,5,10">
                 <Grid>
                     <Grid.ColumnDefinitions>
                         <ColumnDefinition Width="100"/>
@@ -646,7 +654,7 @@
                 </Grid>
             </GroupBox>
 
-            <GroupBox Header="Herkunft" Grid.Column="0" Grid.Row="4" Margin="5,5,5,10">
+            <GroupBox Header="Herkunft" Grid.Column="0" Grid.Row="5" Margin="5,5,5,10">
                 <Grid>
                     <Grid.ColumnDefinitions>
                         <ColumnDefinition Width="100"/>
diff --git a/Elwig/Windows/DeliveryAdminWindow.xaml.cs b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
index 4d44a4d..0a6d622 100644
--- a/Elwig/Windows/DeliveryAdminWindow.xaml.cs
+++ b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
@@ -9,6 +9,7 @@ using Microsoft.EntityFrameworkCore;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Text.Json.Nodes;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
@@ -103,6 +104,7 @@ namespace Elwig.Windows {
                 WeighingBButton.Visibility = Visibility.Hidden;
                 WeighingCButton.Visibility = Visibility.Hidden;
                 WeighingDButton.Visibility = Visibility.Hidden;
+                DisableWeighingButtons();
             }
 
             Menu_Statistics_WineQuality_ModeOe.IsChecked = false;
@@ -612,14 +614,34 @@ namespace Elwig.Windows {
             ClearOriginalValues();
             ClearDefaultValues();
             ViewModel.FillInputs(p);
+            CorrectTareButton.Visibility = !ViewModel.IsReceipt && p.WeighingInfo.Tare != null && p.WeighingInfo.Tare != 0 ? Visibility.Visible : Visibility.Hidden;
             FinishInputFilling();
         }
 
         new protected void ClearInputs(bool validate = false) {
             ViewModel.ClearInputs();
+            CorrectTareButton.Visibility = Visibility.Hidden;
             base.ClearInputs(validate);
         }
 
+        private void CorrectTareButton_Click(object sender, RoutedEventArgs evt) {
+            var lastCorrection = (ViewModel.TargetTare ?? ViewModel.ActualTare) - ViewModel.ActualTare;
+            var correction = Utils.ShowTareCorrectionDialog(ViewModel.ActualTare, ViewModel.TargetTare);
+            if (correction == null) return;
+            ViewModel.Weight += lastCorrection - correction;
+            ViewModel.TargetTare = correction == 0 ? null : ViewModel.ActualTare + correction;
+            ViewModel.Tare = ViewModel.TargetTare ?? ViewModel.ActualTare;
+            if (ViewModel.WeighingData is string s) {
+                var obj = JsonNode.Parse(s)!.AsObject();
+                if (correction == 0) {
+                    obj.Remove("tare_correction");
+                } else {
+                    obj["tare_correction"] = correction;
+                }
+                ViewModel.WeighingData = obj.ToJsonString(Utils.JsonOpts);
+            }
+        }
+
         private void WeighingButton_Click(object sender, RoutedEventArgs evt) {
             int index = Array.IndexOf(WeighingButtons, sender as Button);
             if (index >= 0) WeighingButton_Click(index);
@@ -651,12 +673,18 @@ namespace Elwig.Windows {
         private void OnWeighingResult(IScale scale, WeighingResult res) {
             if ((res.NetWeight ?? 0) > 0 && res.FullWeighingId != null) {
                 ViewModel.Weight = res.NetWeight;
+                ViewModel.ActualTare = res.TareWeight ?? 0;
+                ViewModel.TargetTare = null;
+                ViewModel.Tare = ViewModel.ActualTare != 0 ? ViewModel.ActualTare : null;
                 ViewModel.ScaleTerminalId = scale.ScaleTerminalId;
                 ViewModel.WeighingData = res.ToJson().ToJsonString();
                 ViewModel.ManualWeighingReason = null;
                 ManualWeighingInput.IsChecked = false;
             } else {
                 ViewModel.Weight = null;
+                ViewModel.ActualTare = 0;
+                ViewModel.TargetTare = null;
+                ViewModel.Tare = null;
                 ViewModel.ScaleTerminalId = null;
                 ViewModel.WeighingData = null;
             }
@@ -971,6 +999,8 @@ namespace Elwig.Windows {
             DeliveryList.IsEnabled = false;
             DeliveryPartList.IsEnabled = false;
 
+            if (!ViewModel.IsReceipt)
+                EnableWeighingButtons();
             HideNewEditDeleteButtons();
             ShowSaveResetCancelButtons();
             UnlockInputs();
@@ -1034,6 +1064,8 @@ namespace Elwig.Windows {
             DeliveryList.IsEnabled = true;
             DeliveryPartList.IsEnabled = true;
 
+            if (!ViewModel.IsReceipt)
+                DisableWeighingButtons();
             HideSaveResetCancelButtons();
             ShowNewEditDeleteButtons();
             LockInputs();
@@ -1067,6 +1099,8 @@ namespace Elwig.Windows {
             DeliveryList.IsEnabled = true;
             DeliveryPartList.IsEnabled = true;
 
+            if (!ViewModel.IsReceipt)
+                DisableWeighingButtons();
             HideSaveResetCancelButtons();
             ShowNewEditDeleteButtons();
             RefreshInputs();
@@ -1171,6 +1205,7 @@ namespace Elwig.Windows {
         }
 
         private void DisableWeighingButtons() {
+            CorrectTareButton.IsEnabled = false;
             WeighingManualButton.IsEnabled = false;
             WeighingAButton.IsEnabled = false;
             WeighingBButton.IsEnabled = false;
@@ -1179,6 +1214,7 @@ namespace Elwig.Windows {
         }
 
         private void EnableWeighingButtons() {
+            CorrectTareButton.IsEnabled = true;
             WeighingManualButton.IsEnabled = true;
             var n = App.CommandScales.Count;
             WeighingAButton.IsEnabled = n > 0 && App.CommandScales[0].IsReady;