diff --git a/Elwig/Helpers/Billing/BillingVariant.cs b/Elwig/Helpers/Billing/BillingVariant.cs
index 79f3e43..2e0bda0 100644
--- a/Elwig/Helpers/Billing/BillingVariant.cs
+++ b/Elwig/Helpers/Billing/BillingVariant.cs
@@ -1,3 +1,6 @@
+using Elwig.Models.Entities;
+using Microsoft.Data.Sqlite;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
@@ -5,18 +8,23 @@ using System.Threading.Tasks;
 namespace Elwig.Helpers.Billing {
     public class BillingVariant : Billing {
 
-        private readonly int AvNr;
+        protected readonly int AvNr;
+        protected readonly PaymentVar PaymentVariant;
 
         public BillingVariant(int year, int avnr) : base(year) {
             AvNr = avnr;
+            PaymentVariant = Context.PaymentVariants.Find(Year, AvNr) ?? throw new ArgumentException("PaymentVar not found");
         }
 
         public async Task Calculate() {
-            await DeleteInDb();
-            await SetCalcTime();
-            await CalculatePrices();
-            await CalculateModifiers();
-            await CalculateMemberModifiers();
+            using var cnx = await AppDbContext.ConnectAsync();
+            using var tx = await cnx.BeginTransactionAsync();
+            await DeleteInDb(cnx);
+            await SetCalcTime(cnx);
+            await CalculatePrices(cnx);
+            await CalculateModifiers(cnx);
+            await CalculateMemberModifiers(cnx);
+            await tx.CommitAsync();
         }
 
         public async Task Commit() {
@@ -68,15 +76,13 @@ namespace Elwig.Helpers.Billing {
                 """);
         }
 
-        protected async Task SetCalcTime() {
-            using var cnx = await AppDbContext.ConnectAsync();
+        protected async Task SetCalcTime(SqliteConnection cnx) {
             await AppDbContext.ExecuteBatch(cnx, $"""
                 UPDATE payment_variant SET calc_time = UNIXEPOCH() WHERE (year, avnr) = ({Year}, {AvNr})
                 """);
         }
 
-        protected async Task DeleteInDb() {
-            using var cnx = await AppDbContext.ConnectAsync();
+        protected async Task DeleteInDb(SqliteConnection cnx) {
             await AppDbContext.ExecuteBatch(cnx, $"""
                 DELETE FROM payment_delivery_part_bucket WHERE (year, avnr) = ({Year}, {AvNr});
                 DELETE FROM payment_delivery_part WHERE (year, avnr) = ({Year}, {AvNr});
@@ -85,8 +91,7 @@ namespace Elwig.Helpers.Billing {
                 """);
         }
 
-        protected async Task CalculateMemberModifiers() {
-            using var cnx = await AppDbContext.ConnectAsync();
+        protected async Task CalculateMemberModifiers(SqliteConnection cnx) {
             if (App.Client.IsMatzen) {
                 var lastYears = 3;
                 var multiplier = 0.50;
@@ -113,13 +118,22 @@ namespace Elwig.Helpers.Billing {
             }
         }
 
-        protected async Task CalculatePrices() {
-            using var cnx = await AppDbContext.ConnectAsync();
+        protected async Task CalculatePrices(SqliteConnection cnx) {
+            var jsonData = PaymentVariant.Data;
+            var attrVariants = Context.DeliveryParts
+                .Where(d => d.Year == Year)
+                .Select(d => $"{d.SortId}{d.AttrId}")
+                .Distinct()
+                .ToList()
+                .Union(Context.WineVarieties.Select(v => v.SortId))
+                .ToList();
 
-            var parts = new List<(int Year, int DId, int DPNr, int BktNr, string SortId, string Discr, int Value, bool MinQuw, double Oe, double Kmw)>();
+            var data = BillingData.FromJson(jsonData, attrVariants);
+
+            var parts = new List<(int Year, int DId, int DPNr, int BktNr, string SortId, string Discr, int Value, double Oe, double Kmw, string QualId)>();
             using (var cmd = cnx.CreateCommand()) {
                 cmd.CommandText = $"""
-                    SELECT d.year, d.did, d.dpnr, b.bktnr, d.sortid, b.discr, b.value, d.min_quw, d.oe, d.kmw
+                    SELECT d.year, d.did, d.dpnr, b.bktnr, d.sortid, b.discr, b.value, d.oe, d.kmw, d.qualid
                     FROM delivery_part_bucket b
                         JOIN v_delivery d ON (d.year, d.did, d.dpnr) = (b.year, b.did, b.dpnr)
                     WHERE b.year = {Year}
@@ -129,18 +143,17 @@ namespace Elwig.Helpers.Billing {
                     parts.Add((
                         reader.GetInt32(0), reader.GetInt32(1), reader.GetInt32(2), reader.GetInt32(3),
                         reader.GetString(4), reader.GetString(5), reader.GetInt32(6),
-                        reader.GetBoolean(7), reader.GetDouble(8), reader.GetDouble(9)
+                        reader.GetDouble(7), reader.GetDouble(8), reader.GetString(9)
                     ));
                 }
             }
 
             var inserts = new List<(int Year, int DId, int DPNr, int BktNr, long Price, long Amount)>();
             foreach (var part in parts) {
-                var price = !part.MinQuw ? 0.5m : ((part.BktNr == 2 ? 0.8m : (part.BktNr == 1 ? 0.7m : 0.6m)) + ((decimal)(part.Oe - 73) * 0.005m));  // TODO
-                price += (AvNr - 1) * 0.2m;
-                var priceL = Utils.DecToDb(price, 4);
-                var amount = Utils.DecToDb(price * part.Value, 4);
-                inserts.Add((part.Year, part.DId, part.DPNr, part.BktNr, priceL, amount));
+                var attrId = (part.Discr == "_" || part.Discr == "") ? null : part.Discr;
+                var price = data.CalculatePrice(part.SortId, attrId, part.QualId, part.Discr != "_", part.Oe, part.Kmw);
+                var priceL = PaymentVariant.Season.DecToDb(price);
+                inserts.Add((part.Year, part.DId, part.DPNr, part.BktNr, priceL, priceL * part.Value));
             }
 
             await AppDbContext.ExecuteBatch(cnx, $"""
@@ -149,8 +162,7 @@ namespace Elwig.Helpers.Billing {
                 """);
         }
 
-        protected async Task CalculateModifiers() {
-            using var cnx = await AppDbContext.ConnectAsync();
+        protected async Task CalculateModifiers(SqliteConnection cnx) {
             await AppDbContext.ExecuteBatch(cnx, $"""
                 INSERT INTO payment_delivery_part (year, did, dpnr, avnr, net_amount, mod_abs, mod_rel)
                 SELECT d.year, d.did, d.dpnr, {AvNr}, 0, COALESCE(m.abs, 0), COALESCE(m.rel, 0)
diff --git a/Elwig/Windows/PaymentVariantsWindow.xaml b/Elwig/Windows/PaymentVariantsWindow.xaml
index 3991b8c..93cda0b 100644
--- a/Elwig/Windows/PaymentVariantsWindow.xaml
+++ b/Elwig/Windows/PaymentVariantsWindow.xaml
@@ -6,7 +6,7 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:Elwig.Windows"
         mc:Ignorable="d"
-        Title="Auszahlungsvarianten - Elwig" Height="450" Width="800" MinHeight="400" MinWidth="700">
+        Title="Auszahlungsvarianten - Elwig" Height="500" Width="820" MinHeight="500" MinWidth="820">
     <Window.Resources>
         <Style TargetType="Label">
             <Setter Property="HorizontalAlignment" Value="Left"/>
@@ -41,8 +41,8 @@
             <ColumnDefinition Width="*"/>
         </Grid.ColumnDefinitions>
         <Grid.RowDefinitions>
-            <RowDefinition Height="200"/>
             <RowDefinition Height="*"/>
+            <RowDefinition Height="200"/>
         </Grid.RowDefinitions>
 
         <ListBox x:Name="PaymentVariantList" Margin="10,10,35,10" Grid.RowSpan="2" SelectionChanged="PaymentVariantList_SelectionChanged">
@@ -66,45 +66,96 @@
                 VerticalAlignment="Center" HorizontalAlignment="Right" Width="25" Height="25" Margin="5,60,5,0" Grid.RowSpan="2"/>
 
         <Label Content="Name:" Margin="10,10,0,0" Grid.Column="1"/>
-        <TextBox x:Name="NameInput" Width="200" Grid.Column="2" HorizontalAlignment="Left" Margin="0,10,0,0"/>
+        <TextBox x:Name="NameInput" Width="200" Grid.Column="2" HorizontalAlignment="Left" Margin="0,10,0,0"
+                 TextChanged="NameInput_TextChanged"/>
 
         <Label Content="Beschreibung:" Margin="10,40,0,0" Grid.Column="1"/>
-        <TextBox x:Name="CommentInput" Grid.Column="2" HorizontalAlignment="Stretch" Margin="0,40,10,0"/>
+        <TextBox x:Name="CommentInput" Grid.Column="2" HorizontalAlignment="Stretch" Margin="0,40,10,0"
+                 TextChanged="CommentInput_TextChanged"/>
 
         <Label Content="Erstellt am:" Margin="10,70,0,0" Grid.Column="1"/>
-        <TextBox x:Name="DateInput" Grid.Column="2" Width="77" HorizontalAlignment="Left" Margin="0,70,10,0"/>
+        <TextBox x:Name="DateInput" Grid.Column="2" Width="77" HorizontalAlignment="Left" Margin="0,70,10,0" IsReadOnly="True"/>
 
         <Label Content="Überwiesen am:" Margin="10,100,0,0" Grid.Column="1"/>
-        <TextBox x:Name="TransferDateInput" Grid.Column="2" Width="77" HorizontalAlignment="Left" Margin="0,100,10,0"/>
+        <TextBox x:Name="TransferDateInput" Grid.Column="2" Width="77" HorizontalAlignment="Left" Margin="0,100,10,0"
+                 TextChanged="TransferDateInput_TextChanged"/>
+
+        <TextBox x:Name="DataInput" Margin="82,70,10,42" Grid.Column="2"
+                 HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Height="auto"
+                 AcceptsReturn="True" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Auto"
+                 FontFamily="Cascadia Code Light" FontSize="13"
+                 TextChanged="DataInput_TextChanged"/>
+
+        <Button x:Name="SaveButton" Content="Speichern" Grid.Column="1" Grid.ColumnSpan="2"
+                Click="SaveButton_Click"
+                VerticalAlignment="Bottom" HorizontalAlignment="Center" Width="100" Margin="10,10,325,10"/>
+        <Button x:Name="CommitButton" Content="Festsetzen" Grid.Column="1" Grid.ColumnSpan="2"
+                Click="CommitButton_Click"
+                VerticalAlignment="Bottom" HorizontalAlignment="Center" Width="100" Margin="10,10,115,10"/>
+        <Button x:Name="RevertButton" Content="Freigeben" Grid.Column="1" Grid.ColumnSpan="2"
+                Click="RevertButton_Click"
+                VerticalAlignment="Bottom" HorizontalAlignment="Center" Width="100" Margin="10,10,115,10"/>
         <Button x:Name="CalculateButton" Content="Berechnen" Grid.Column="1" Grid.ColumnSpan="2"
                 Click="CalculateButton_Click"
-                VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="100" Margin="10,10,115,10"/>
+                VerticalAlignment="Bottom" HorizontalAlignment="Center" Width="100" Margin="115,10,10,10"/>
         <Button x:Name="EditButton" Content="Bearbeiten" Grid.Column="1" Grid.ColumnSpan="2"
                 Click="EditButton_Click"
-                VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="100" Margin="10,10,10,10"/>
+                VerticalAlignment="Bottom" HorizontalAlignment="Center" Width="100" Margin="325,10,10,10"/>
 
-        <GroupBox Header="Abschluss" Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2" Margin="10,0,10,10">
-            <Grid>
-                <Button x:Name="CommitButton" FontSize="12" Width="160" Height="40" Margin="0,0,10,55"
-                        Click="CommitButton_Click"
-                        VerticalAlignment="Bottom" HorizontalAlignment="Right">
-                    <TextBlock TextAlignment="Center">Traubengutschriften<LineBreak/>erstellen</TextBlock>
-                </Button>
-                <Button x:Name="RevertButton" FontSize="12" Width="160" Height="40" Margin="0,0,10,10"
-                        Click="RevertButton_Click"
-                        VerticalAlignment="Bottom" HorizontalAlignment="Right">
-                    <TextBlock TextAlignment="Center">Traubengutschriften<LineBreak/>löschen</TextBlock>
-                </Button>
+        <Grid Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*"/>
+                <ColumnDefinition Width="250"/>
+            </Grid.ColumnDefinitions>
 
-                <ProgressBar x:Name="ProgressBar" Margin="10,0,0,74" Height="27" Width="180"
-                             VerticalAlignment="Bottom" HorizontalAlignment="Left"/>
-                <Button x:Name="ShowButton" Content="Vorschau" FontSize="14" Width="180" Margin="10,10,10,42" Height="27" Tag="Print" IsEnabled="False"
-                        Click="ShowButton_Click"
-                        VerticalAlignment="Bottom" HorizontalAlignment="Left"/>
-                <Button x:Name="PrintButton" Content="Drucken" FontSize="14" Width="180" Margin="10,10,10,10" Height="27" Tag="Print" IsEnabled="False"
-                        Click="PrintButton_Click"
-                        VerticalAlignment="Bottom" HorizontalAlignment="Left"/>
-            </Grid>
-        </GroupBox>
+            <GroupBox Header="Abschluss" Margin="10,0,5,10">
+                <Grid>
+                    <Button x:Name="ExportButton" Content="Exportieren" FontSize="14" Width="180" Margin="10,10,10,10" Height="27" IsEnabled="False"
+                            Click="ExportButton_Click"
+                            VerticalAlignment="Top" HorizontalAlignment="Left"/>
+
+                    <ProgressBar x:Name="ProgressBar" Margin="10,10,10,74" Height="27" Width="180"
+                                 VerticalAlignment="Bottom" HorizontalAlignment="Left"/>
+                    <Button x:Name="ShowButton" Content="Vorschau" FontSize="14" Width="180" Margin="10,10,10,42" Height="27" Tag="Print" IsEnabled="False"
+                            Click="ShowButton_Click"
+                            VerticalAlignment="Bottom" HorizontalAlignment="Left"/>
+                    <Button x:Name="PrintButton" Content="Drucken" FontSize="14" Width="180" Margin="10,10,10,10" Height="27" Tag="Print" IsEnabled="False"
+                            Click="PrintButton_Click"
+                            VerticalAlignment="Bottom" HorizontalAlignment="Left"/>
+                </Grid>
+            </GroupBox>
+
+            <GroupBox Header="Ergebnis" Margin="5,0,10,10" Grid.Column="1">
+                <Grid>
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="100"/>
+                        <ColumnDefinition Width="*"/>
+                    </Grid.ColumnDefinitions>
+                    <Grid.Resources>
+                        <Style TargetType="TextBlock">
+                            <Setter Property="Grid.Column" Value="1"/>
+                            <Setter Property="VerticalAlignment" Value="Top"/>
+                            <Setter Property="FontSize" Value="14"/>
+                            <Setter Property="TextAlignment" Value="Right"/>
+                        </Style>
+                    </Grid.Resources>
+
+                    <Label Content="Zu-/Abschläge:" Margin="10,10,0,0"/>
+                    <TextBlock x:Name="ModifierSum" Margin="0,12,10,0"/>
+
+                    <Label Content="Gesamtbeträge:" Margin="10,40,0,0"/>
+                    <TextBlock x:Name="TotalSum" Margin="0,42,10,0"/>
+
+                    <Label Content="Mehrwertsteuer:" Margin="10,70,0,0"/>
+                    <TextBlock x:Name="VatSum" Margin="0,72,10,0"/>
+
+                    <Label Content="Abzüge:" Margin="10,100,0,0"/>
+                    <TextBlock x:Name="DeductionSum" Margin="0,102,10,0"/>
+
+                    <Label Content="Auszuzahlen:" Margin="10,130,0,0"/>
+                    <TextBlock x:Name="PaymentSum" Margin="0,132,10,0"/>
+                </Grid>
+            </GroupBox>
+        </Grid>
     </Grid>
 </local:ContextWindow>
diff --git a/Elwig/Windows/PaymentVariantsWindow.xaml.cs b/Elwig/Windows/PaymentVariantsWindow.xaml.cs
index c3cf985..b2ae356 100644
--- a/Elwig/Windows/PaymentVariantsWindow.xaml.cs
+++ b/Elwig/Windows/PaymentVariantsWindow.xaml.cs
@@ -11,16 +11,25 @@ using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
 using Elwig.Helpers.Billing;
+using Elwig.Helpers.Export;
+using Microsoft.Win32;
+using System.Text.Json;
 
 namespace Elwig.Windows {
     public partial class PaymentVariantsWindow : ContextWindow {
 
         public readonly int Year;
+        private bool DataValid, DataChanged, NameChanged, CommentChanged, TransferDateValid, TransferDateChanged;
+
+        private static readonly JsonSerializerOptions JsonOpt = new() { WriteIndented = true };
 
         public PaymentVariantsWindow(int year) {
             InitializeComponent();
             Year = year;
             Title = $"Auszahlungsvarianten - Lese {Year} - Elwig";
+            if (!App.Config.Debug) {
+                DataInput.Visibility = Visibility.Hidden;
+            }
         }
 
         protected override async Task OnRenewContext() {
@@ -34,26 +43,74 @@ namespace Elwig.Windows {
                 DeleteButton.IsEnabled = !locked;
                 CalculateButton.IsEnabled = !locked;
                 CommitButton.IsEnabled = !locked;
+                CommitButton.Visibility = !locked ? Visibility.Visible : Visibility.Hidden;
                 RevertButton.IsEnabled = locked;
+                RevertButton.Visibility = locked ? Visibility.Visible : Visibility.Hidden;
                 CopyButton.IsEnabled = true;
-                EditButton.IsEnabled = true;
+                EditButton.Content = locked ? "Ansehen" : "Bearbeiten";
                 ShowButton.IsEnabled = true;
                 PrintButton.IsEnabled = true;
+                ExportButton.IsEnabled = locked;
 
                 NameInput.Text = v.Name;
                 CommentInput.Text = v.Comment;
+                DateInput.Text = $"{v.Date:dd.MM.yyyy}";
+                TransferDateInput.Text = $"{v.TransferDate:dd.MM.yyyy}";
+                try {
+                    var json = BillingData.ParseJson(v.Data);
+                    DataInput.Text = JsonSerializer.Serialize(json, JsonOpt);
+                } catch {
+                    DataInput.Text = v.Data;
+                }
             } else {
-                EditButton.IsEnabled = false;
+                EditButton.Content = "Bearbeiten";
                 CopyButton.IsEnabled = false;
                 CalculateButton.IsEnabled = false;
                 CommitButton.IsEnabled = false;
+                CommitButton.Visibility = Visibility.Visible;
                 RevertButton.IsEnabled = false;
+                RevertButton.Visibility = Visibility.Hidden;
                 DeleteButton.IsEnabled = false;
                 ShowButton.IsEnabled = false;
                 PrintButton.IsEnabled = false;
+                ExportButton.IsEnabled = false;
 
                 NameInput.Text = "";
                 CommentInput.Text = "";
+                DateInput.Text = "";
+                TransferDateInput.Text = "";
+                DataInput.Text = "";
+            }
+            UpdateSums();
+            UpdateSaveButton();
+        }
+
+        private void UpdateSaveButton() {
+            SaveButton.IsEnabled = PaymentVariantList.SelectedItem != null &&
+                ((DataChanged && DataValid) || NameChanged || CommentChanged ||
+                (TransferDateChanged && TransferDateValid));
+        }
+
+        private void UpdateSums() {
+            if (PaymentVariantList.SelectedItem is PaymentVar v) {
+                var sym = v.Season.Currency.Symbol;
+                ModifierSum.Text = $"{v.DeliveryPartPayments.Sum(p => p.Amount - p.NetAmount):N2} {sym}";
+                TotalSum.Text = $"{v.MemberPayments.Sum(p => p.Amount):N2} {sym}";
+                if (v.Credits.Count == 0) {
+                    VatSum.Text = $"- {sym}";
+                    DeductionSum.Text = $"- {sym}";
+                    PaymentSum.Text = $"- {sym}";
+                } else {
+                    VatSum.Text = $"{v.Credits.Sum(c => c.VatAmount):N2} {sym}";
+                    DeductionSum.Text = $"{-v.Credits.Sum(c => c.Modifiers ?? 0):N2} {sym}";
+                    PaymentSum.Text = $"{v.Credits.Sum(c => c.Amount):N2} {sym}";
+                }
+            } else {
+                ModifierSum.Text = "-";
+                TotalSum.Text = "-";
+                VatSum.Text = "-";
+                DeductionSum.Text = "-";
+                PaymentSum.Text = "-";
             }
         }
 
@@ -78,8 +135,13 @@ namespace Elwig.Windows {
                 return;
             CalculateButton.IsEnabled = false;
             Mouse.OverrideCursor = Cursors.AppStarting;
-            var b = new BillingVariant(v.Year, v.AvNr);
-            await b.Calculate();
+            try {
+                var b = new BillingVariant(v.Year, v.AvNr);
+                await b.Calculate();
+            } catch (Exception exc) {
+                MessageBox.Show(exc.Message, "Berechnungsfehler", MessageBoxButton.OK, MessageBoxImage.Error);
+            }
+            await App.HintContextChange();
             Mouse.OverrideCursor = null;
             CalculateButton.IsEnabled = true;
         }
@@ -98,7 +160,7 @@ namespace Elwig.Windows {
             await Generate(2);
         }
 
-        private async void CommitButton_Click(object sender, RoutedEventArgs e) {
+        private async void CommitButton_Click(object sender, RoutedEventArgs evt) {
             if (PaymentVariantList.SelectedValue is not PaymentVar v)
                 return;
             CommitButton.IsEnabled = false;
@@ -107,19 +169,140 @@ namespace Elwig.Windows {
             await b.Commit();
             Mouse.OverrideCursor = null;
             RevertButton.IsEnabled = true;
-            await HintContextChange();
+            await App.HintContextChange();
         }
 
-        private async void RevertButton_Click(object sender, RoutedEventArgs e) {
+        private async void RevertButton_Click(object sender, RoutedEventArgs evt) {
             if (PaymentVariantList.SelectedValue is not PaymentVar v)
                 return;
+            var res = MessageBox.Show(
+                "Sollen wirklich alle festgesetzten Traubengutschriften der ausgewählten Auszahlungsvariante unwiderruflich gelöscht werden?\n\n" +
+                "Dies ist im Allgemeinen nie empfohlen. Handelt es sich um die aktuellste Auszahlungsvariante könnte das eine Ausnahme sein.",
+                "Traubengutschriften löschen", MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);
+            if (res != MessageBoxResult.Yes)
+                return;
             RevertButton.IsEnabled = false;
             Mouse.OverrideCursor = Cursors.AppStarting;
             var b = new BillingVariant(v.Year, v.AvNr);
             await b.Revert();
             Mouse.OverrideCursor = null;
             CommitButton.IsEnabled = true;
-            await HintContextChange();
+            await App.HintContextChange();
+        }
+
+        private async void ExportButton_Click(object sender, RoutedEventArgs evt) {
+            if (PaymentVariantList.SelectedValue is not PaymentVar v) {
+                return;
+            } else if (v.TransferDate == null) {
+                MessageBox.Show("Überweisungsdatum muss gesetzt sein!", "Exportieren nicht möglich", MessageBoxButton.OK, MessageBoxImage.Error);
+                return;
+            }
+            var d = new SaveFileDialog() {
+                FileName = $"{App.Client.NameToken}-Überweisungsdaten-{v.Year}-{v.Name.Trim().Replace(' ', '-')}.{Ebics.FileExtension}",
+                DefaultExt = Ebics.FileExtension,
+                Filter = "EBICS-Datei (*.xml)|*.xml",
+                Title = $"Überweisungsdaten speichern unter - Elwig",
+            };
+            if (d.ShowDialog() == true) {
+                ExportButton.IsEnabled = false;
+                Mouse.OverrideCursor = Cursors.AppStarting;
+                using var e = new Ebics(v, d.FileName);
+                await e.ExportAsync(Transaction.FromPaymentVariant(v));
+                Mouse.OverrideCursor = null;
+                ExportButton.IsEnabled = true;
+            }
+        }
+
+        private async void SaveButton_Click(object sender, RoutedEventArgs evt) {
+            if (PaymentVariantList.SelectedItem is not PaymentVar v) return;
+            try {
+                v.Name = NameInput.Text;
+                v.Comment = (CommentInput.Text != "") ? CommentInput.Text : null;
+                v.TransferDateString = (TransferDateInput.Text != "") ? string.Join("-", TransferDateInput.Text.Split(".").Reverse()) : null;
+                if (App.Config.Debug) v.Data = JsonSerializer.Serialize(BillingData.ParseJson(DataInput.Text));
+                Context.Update(v);
+                await Context.SaveChangesAsync();
+                await App.HintContextChange();
+            } catch (Exception exc) {
+                await HintContextChange();
+                var str = "Der Eintrag konnte nicht in der Datenbank aktualisiert werden!\n\n" + exc.Message;
+                if (exc.InnerException != null) str += "\n\n" + exc.InnerException.Message;
+                MessageBox.Show(str, "Auszahlungsvariante aktualisieren", MessageBoxButton.OK, MessageBoxImage.Error);
+            }
+        }
+
+        private void NameInput_TextChanged(object sender, TextChangedEventArgs evt) {
+            if (PaymentVariantList.SelectedItem is not PaymentVar v) {
+                ControlUtils.ClearInputState(NameInput);
+                return;
+            }
+            if (NameInput.Text != v.Name) {
+                ControlUtils.SetInputChanged(NameInput);
+                NameChanged = true;
+            } else {
+                ControlUtils.ClearInputState(NameInput);
+                NameChanged = false;
+            }
+            UpdateSaveButton();
+        }
+
+        private void CommentInput_TextChanged(object sender, TextChangedEventArgs evt) {
+            if (PaymentVariantList.SelectedItem is not PaymentVar v) {
+                ControlUtils.ClearInputState(CommentInput);
+                return;
+            }
+            if (CommentInput.Text != (v.Comment ?? "")) {
+                ControlUtils.SetInputChanged(CommentInput);
+                CommentChanged = true;
+            } else {
+                ControlUtils.ClearInputState(CommentInput);
+                CommentChanged = false;
+            }
+            UpdateSaveButton();
+        }
+
+        private void TransferDateInput_TextChanged(object sender, TextChangedEventArgs evt) {
+            if (PaymentVariantList.SelectedItem is not PaymentVar v) {
+                ControlUtils.ClearInputState(TransferDateInput);
+                return;
+            }
+            var res = Validator.CheckDate(TransferDateInput, false);
+            if (!res.IsValid) {
+                ControlUtils.SetInputInvalid(TransferDateInput);
+                TransferDateValid = false;
+            } else if (TransferDateInput.Text != $"{v.TransferDate:dd.MM.yyyy}") {
+                ControlUtils.SetInputChanged(TransferDateInput);
+                TransferDateValid = true;
+                TransferDateChanged = true;
+            } else {
+                ControlUtils.ClearInputState(TransferDateInput);
+                TransferDateValid = true;
+                TransferDateChanged = false;
+            }
+            UpdateSaveButton();
+        }
+
+        private void DataInput_TextChanged(object sender, TextChangedEventArgs evt) {
+            if (PaymentVariantList.SelectedItem is not PaymentVar v) {
+                ControlUtils.ClearInputState(DataInput);
+                return;
+            }
+            try {
+                var json = BillingData.ParseJson(DataInput.Text);
+                var origJson = BillingData.ParseJson(v.Data);
+                DataValid = true;
+                if (JsonSerializer.Serialize(json) != JsonSerializer.Serialize(origJson)) {
+                    ControlUtils.SetInputChanged(DataInput);
+                    DataChanged = true;
+                } else {
+                    ControlUtils.ClearInputState(DataInput);
+                    DataChanged = false;
+                }
+            } catch {
+                ControlUtils.SetInputInvalid(DataInput);
+                DataValid = false;
+            }
+            UpdateSaveButton();
         }
 
         private async Task Generate(int mode) {