due date transection notification

Hi All,

we need to restrict few user to update due date field on production order.

thx in advance for same..

i have try below code but not working:

IF@TRANSACTION_TYPEIN('U')AND@OBJECT_TYPE='202'  --Production Order

BEGIN

ifexists(selectt1.duedatefromOUSRT0  INNERJOINOWORT1ONT0.USERID=T1.UserSign  where  T1.docentry=@list_of_cols_val_tab_deland(t1.duedate>t1.duedate)andt0.USERIDin(140,138,131,39))

--begin

SELECT@ERROR=1,@ERROR_MESSAGE='you are not allowed to change due date.'

end