Module Pool Programming - noninput screen

Hi Folks,
I have a requirement where i need to have check box.When check box is checked screen fields should be enabled else it should be disabled. Please suggest me.
If the checkbox is checked fields should become mandatory.
Please suggest

PROGRAM  ZSRK_025                                .
DATA : F1 LIKE VBAP-VBELN,
       F2 LIKE VBAP-POSNR,
       F3 LIKE VBAP-NETWR.
DATA : CH1,
       CH2,
       CH3.
*&      Module  STATUS_0100  OUTPUT
      text
MODULE STATUS_0100 OUTPUT.
  IF CH1 EQ 'X'.
    LOOP AT SCREEN.
      IF SCREEN-NAME = 'F1'.
        SCREEN-INPUT = 1.
      ENDIF.
      MODIFY SCREEN.
    ENDLOOP.
  ELSE.
    LOOP AT SCREEN.
      IF SCREEN-NAME = 'F1'.
        SCREEN-INPUT = 0.
      ENDIF.
      MODIFY SCREEN.
    ENDLOOP.
  ENDIF.
  IF CH2 EQ 'X'.
    LOOP AT SCREEN.
      IF SCREEN-NAME = 'F2'.
        SCREEN-INPUT = 1.
      ENDIF.
      MODIFY SCREEN.
    ENDLOOP.
  ELSE.
    LOOP AT SCREEN.
      IF SCREEN-NAME = 'F2'.
        SCREEN-INPUT = 0.
      ENDIF.
      MODIFY SCREEN.
    ENDLOOP.
  ENDIF.
  IF CH3 EQ 'X'.
    LOOP AT SCREEN.
      IF SCREEN-NAME = 'F3'.
        SCREEN-INPUT = 1.
      ENDIF.
      MODIFY SCREEN.
    ENDLOOP.
  ELSE.
    LOOP AT SCREEN.
      IF SCREEN-NAME = 'F3'.
        SCREEN-INPUT = 0.
      ENDIF.
      MODIFY SCREEN.
    ENDLOOP.
  ENDIF.
ENDMODULE.                 " STATUS_0100  OUTPUT
PROCESS BEFORE OUTPUT.
  MODULE STATUS_0100.
PROCESS AFTER INPUT.
MODULE USER_COMMAND_0100.

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