diff --git a/Elwig/Services/DeliveryService.cs b/Elwig/Services/DeliveryService.cs
index 5940afd..20dd656 100644
--- a/Elwig/Services/DeliveryService.cs
+++ b/Elwig/Services/DeliveryService.cs
@@ -444,6 +444,7 @@ namespace Elwig.Services {
 
             var date = DateOnly.ParseExact(vm.Date!, "dd.MM.yyyy");
             int? newLnr = (deliveryNew || dateHasChanged) ? await ctx.NextLNr(date) : null;
+            string? newLsNr = (newLnr != null) ? Utils.GenerateLsNr(date, vm.Branch!.ZwstId, newLnr.Value) : null;
 
             string? newTimeString = null;
             if (partNew && timeIsDefault) {
@@ -459,7 +460,7 @@ namespace Elwig.Services {
                 TimeString = newTimeString ?? oldDelivery?.TimeString,
                 LNr = newLnr ?? oldDelivery!.LNr,
                 ZwstId = vm.Branch!.ZwstId,
-                LsNr = vm.LsNr!,
+                LsNr = newLsNr ?? vm.LsNr!,
                 MgNr = (int)vm.MgNr!,
                 Comment = string.IsNullOrEmpty(vm.Comment) ? null : vm.Comment,
             };