Grey out an option of Radio Button on Selection Screen

AUTHORITY-CHECK OBJECT ‘ZRE400DDD’
ID ‘ZRE400DDD’ FIELD ‘ACTUAL’.
IF sy–subrc <> 0.
LOOP AT SCREEN.
IF screen–name = ‘RB_ACT’.
screen–input = ‘0’.
screen–intensified = ‘0’.
MODIFY SCREEN.
ENDIF.
ENDLOOP.
ENDIF.