HI CHINTU
IN THE BELOW CODE
LOOP AT SCREEN.
if flag = X and land1 is initial.
IF screen-name = 'LAND1'.
screen-required = '1'.
MODIFY SCREEN.
ENDIF.
ENDIF.
ENDLOOP.
LAND1 IS ALWAYS INITIAL FIRST TIME. EVEN IF YOU CLICK ON DISPLAY IT RAISE SAME ERROR. AND HOW TO DECLARE FLAG.