Double entry of component in BOM

Question

Good Day..,,
I'd like to make a query (StoredProcedure) that will restrict the double entry of same component in BOM. I created a script but it doesn't work. Below is the script i made.
If @object_Type ='66' and @Transaction_Type in ('A','U')
Begin
Declare @Component NVARCHAR (20)
Set @Component= (Select isnull(T0.Code,'')From Itt1 T0 where t0.Father = @list_of_cols_val_tab_del)
If @Component= '' and Exists (Select T0.Code From Itt1 T0 where T0.Father = @Component and T0.Father!= @list_of_cols_val_tab_del)
Begin
Set @error=1
Set @error_message = N'Component Already exist!!'
End
End
Your help will be very much appreciated. Thanks.
Regards,
Ardie

Answer 1

Hi Ardie,
Of course, use this
IF @object_type='202'AND @transaction_type IN('A','U')
  BEGIN
     IF EXISTS
     (SELECT ItemCode,COUNT(ItemCode)FROM WOR1 WHERE DocEntry=@list_of_cols_val_tab_del
      GROUP BY ItemCode HAVING COUNT(ItemCode)>1)
       BEGIN
          SET @error=-123
          SET @error_message='Duplicate raw material exist'
       END
  END
Best Regards,
Hendry Wijaya