diff --git a/Elwig/Helpers/Billing/BillingVariant.cs b/Elwig/Helpers/Billing/BillingVariant.cs
index 7cb41a2..e14c14b 100644
--- a/Elwig/Helpers/Billing/BillingVariant.cs
+++ b/Elwig/Helpers/Billing/BillingVariant.cs
@@ -20,13 +20,19 @@ namespace Elwig.Helpers.Billing {
             Data = PaymentBillingData.FromJson(PaymentVariant.Data, Utils.GetVaributes(ctx, Year, onlyDelivered: false));
         }
 
-        public async Task Calculate(bool? honorGebunden = null, bool? allowAttrsIntoLower = null, bool? avoidUnderDeliveries = null) {
+        public async Task Calculate(bool strictPrices = true, bool? honorGebunden = null, bool? allowAttrsIntoLower = null, bool? avoidUnderDeliveries = null) {
             using var cnx = await AppDbContext.ConnectAsync();
             using var tx = await cnx.BeginTransactionAsync();
             await CalculateBuckets(honorGebunden, allowAttrsIntoLower, avoidUnderDeliveries, cnx);
             await DeleteInDb(cnx);
             await SetCalcTime(cnx);
-            await CalculatePrices(cnx);
+            KeyNotFoundException? exception = null;
+            try {
+                await CalculatePrices(cnx, strictPrices);
+            } catch (KeyNotFoundException e) {
+                if (strictPrices) throw;
+                exception = e;
+            }
             if (Data.ConsiderDelieryModifiers) {
                 await CalculateDeliveryModifiers(cnx);
             }
@@ -34,6 +40,8 @@ namespace Elwig.Helpers.Billing {
                 await CalculateMemberModifiers(cnx);
             }
             await tx.CommitAsync();
+            if (exception != null)
+                throw exception;
         }
 
         public async Task Commit() {
@@ -142,7 +150,8 @@ namespace Elwig.Helpers.Billing {
                 """);
         }
 
-        protected async Task CalculatePrices(SqliteConnection cnx) {
+        protected async Task CalculatePrices(SqliteConnection cnx, bool strict = true) {
+            var invalid = new HashSet<string>();
             var parts = new List<(int Year, int DId, int DPNr, int BktNr, string SortId, string? AttrId, string? CultId, string Discr, int Value, double Oe, double Kmw, string QualId, bool AttrAreaCom)>();
             using (var cmd = cnx.CreateCommand()) {
                 cmd.CommandText = $"""
@@ -172,15 +181,25 @@ namespace Elwig.Helpers.Billing {
                 var payAttrId = (part.Discr is "" or "_") ? null : part.Discr;
                 var attrId = part.AttrAreaCom ? payAttrId : part.AttrId;
                 var geb = !ungeb && (payAttrId == attrId || !part.AttrAreaCom);
-                var price = Data.CalculatePrice(part.SortId, attrId, part.CultId, part.QualId, geb, part.Oe, part.Kmw);
+                decimal price = 0;
+                try {
+                    price = Data.CalculatePrice(part.SortId, attrId, part.CultId, part.QualId, geb, part.Oe, part.Kmw);
+                } catch (KeyNotFoundException e) {
+                    invalid.Add(e.Message.Split('\'')[1]);
+                }
                 var priceL = PaymentVariant.Season.DecToDb(price);
                 inserts.Add((part.Year, part.DId, part.DPNr, part.BktNr, priceL, priceL * part.Value));
             }
 
+            var msg = invalid.Count == 0 ? null : "Für folgende Sorten wurde noch keine Preiskurve festgelegt: " + string.Join(", ", invalid);
+            if (msg != null && strict)
+                throw new KeyNotFoundException(msg);
             await AppDbContext.ExecuteBatch(cnx, $"""
                 INSERT INTO payment_delivery_part_bucket (year, did, dpnr, bktnr, avnr, price, amount)
                 VALUES {string.Join(",\n       ", inserts.Select(i => $"({i.Year}, {i.DId}, {i.DPNr}, {i.BktNr}, {AvNr}, {i.Price}, {i.Amount})"))};
                 """);
+            if (msg != null)
+                throw new KeyNotFoundException(msg);
         }
 
         protected async Task CalculateDeliveryModifiers(SqliteConnection cnx) {
diff --git a/Elwig/Windows/ChartWindow.xaml.cs b/Elwig/Windows/ChartWindow.xaml.cs
index c65e44c..3b32154 100644
--- a/Elwig/Windows/ChartWindow.xaml.cs
+++ b/Elwig/Windows/ChartWindow.xaml.cs
@@ -664,8 +664,10 @@ namespace Elwig.Windows {
             try {
                 await Task.Run(async () => {
                     var b = new BillingVariant(PaymentVar.Year, PaymentVar.AvNr);
-                    await b.Calculate();
+                    await b.Calculate(false);
                 });
+            } catch (KeyNotFoundException exc) {
+                MessageBox.Show(exc.Message, "Noch nicht alle Preise festgelegt", MessageBoxButton.OK, MessageBoxImage.Information);
             } catch (Exception exc) {
                 MessageBox.Show(exc.Message, "Berechnungsfehler", MessageBoxButton.OK, MessageBoxImage.Error);
             }
diff --git a/Tests/UnitTests/HelperTests/BillingTest.cs b/Tests/UnitTests/HelperTests/BillingTest.cs
index 9cd2b43..f5758b9 100644
--- a/Tests/UnitTests/HelperTests/BillingTest.cs
+++ b/Tests/UnitTests/HelperTests/BillingTest.cs
@@ -188,7 +188,7 @@ namespace Tests.UnitTests.HelperTests {
                 Assert.That(payment["GV"],  Is.EqualTo(10_000));
             });
 
-            await b.Calculate(false, false, false);
+            await b.Calculate(true, false, false, false);
             var prices = await GetMemberDeliveryPrices(year, mgnr);
             Assert.Multiple(() => {
                 Assert.That(prices, Has.Count.EqualTo(7));
@@ -234,7 +234,7 @@ namespace Tests.UnitTests.HelperTests {
                 Assert.That(payment["GV"],  Is.EqualTo(8_000));
             });
 
-            await b.Calculate(true, false, false);
+            await b.Calculate(true, true, false, false);
             var prices = await GetMemberDeliveryPrices(year, mgnr);
             Assert.Multiple(() => {
                 Assert.That(prices, Has.Count.EqualTo(6));