fix 覆盖保存

Src/Dlhis.Basic/BusinessShift/Services/Implements/BusinessPlaceShiftService.cs

@@ -91,8 +91,12 @@ public class BusinessPlaceShiftService : IBusinessPlaceShiftService
         var shiftCode = requests[0].ShiftCode;
         var shift = await CheckExistsShiftAsync(shiftCode);
 
+        await _dbContext.Deleteable<BusinessShiftMealRelationshipEntity>().Where(x => x.ShiftCode == shiftCode).ExecuteCommandAsync();
+        
         foreach (var request in requests)
         {
+            request.Id = null;
+            
             await CheckExistsMealShiftAsync(request);
             await DuplicateTimePeriodAsync(request);