How To call J1iex code?

if Excise invoice part 1 post

SET PARAMETER ID 'J2G' FIELD docno.
SET PARAMETER ID 'GJR' FIELD MJAHR.
CALL TRANSACTION 'J1IEX' AND SKIP FIRST SCREEN..

if Excise invoice part 2 post
SET PARAMETER ID 'J2G' FIELD docno.
SET PARAMETER ID 'GJR' FIELD syear.
CALL TRANSACTION 'J1IEX' AND SKIP FIRST SCREEN.

This code is Not Working Can Any one tell Me How To open J1iex using This Code...