hai.
First it is triggering or not plz check it. change the fields according to your fields.
IF GV_TRTYP = 'A'.
LOOP AT SCREEN.
IF SCREEN-NAME = 'CI_EBANDB-ZZPROJECTNUMBER' OR
SCREEN-NAME = 'CI_EBANDB-ZZKOSTL'.
SCREEN-INPUT = 0.
SCREEN-OUTPUT = 1.
MODIFY SCREEN.
ENDIF.
ENDLOOP.
ELSE.
LOOP AT SCREEN.
SCREEN-INPUT = 1.
MODIFY SCREEN.
ENDLOOP.
ENDIF.