Hi Yoni,
Try this:
If @Object_Type ='17'and @transaction_type in('U')
Begin
If exists (Select 'True' From ORDR Where isnull(U_Field,'N') = 'Y' AND DocEntry = @list_of_cols_val_tab_del)
Begin
Set @error='-9999'
Set @error_message='User cant change document when status is Y’
End
End
Thank you!