Problem with a mandatory field

Question

Hello Experts, Iu2019m trying to make mandatory the u201CNumAtACardu201D field in the u201CA/P invoinceu201D I´m using this code but it doesnu2019t work
If @transaction_type = 'A' AND @Object_type = '18'
begin
if exists (SELECT T0.docnum FROM dbo.OPCH T0
WHERE T0.NumAtCard is null and T0.DOCENTRY = @list_of_cols_val_tab_del)
select @Error = 1, @error_message = 'Enter Vendor Ref. Number'
end
Hope you can help
Thanks.

Answer 1

Hi
I just copied from forum and paste it on my sp_transaction .All I delete was no 1,2,....
I didn't receive any error . 
If @transaction_type = 'A' AND @Object_type = '18'
begin
if (SELECT T0.NumAtCard FROM dbo.OPCH T0
where T0.DOCENTRY = @list_of_cols_val_tab_del) is null
Begin
select @Error = 1, @error_message = 'Enter Vendor Ref. Number'
end
End
Can you try one more time
Thank you
Bishal