In the Database Read Program, add event:
AT SELECTION-SCREEN ON RADIOBUTTON GROUP grp.
READ TABLE screen WITH KEY name = 'OTHER_PD'. "change name to selection screen for period.
IF sy-subrc EQ 0.
IF radio_button6 EQ 'X'.
screen-enabled = '1'.
ELSE.
CLEAR screen-enabled.
ENDIF.
MODIFY SCREEN.
ENDIF.