Grey out the input field as soon as check box checks on selection screen!

Question

HI Experts,
In my report selection screen I have input_field1, input_field2, check_box1. Both input fields are mandatory fileds.
My requireemnt is: If user as soon as checks the check_box1, the first input_field1 must go grey out (not allow allow to enter)!
So I have assigned a user command to check box and assigned a modif-ID to the input_field1
and wrote a LOOP AT SCREEN code as below,
PARAMETERS show_all AS CHECKBOX USER-COMMAND flag.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME.
PARAMETERS: p1 TYPE c LENGTH 10,
            p2 TYPE c LENGTH 10,
            p3 TYPE c LENGTH 10.
SELECTION-SCREEN END OF BLOCK b1.
SELECTION-SCREEN BEGIN OF BLOCK b2 WITH FRAME.
PARAMETERS: p4 TYPE c LENGTH 10 MODIF ID bl2,
            p5 TYPE c LENGTH 10 MODIF ID bl2,
            p6 TYPE c LENGTH 10 MODIF ID bl2.
SELECTION-SCREEN END OF BLOCK b2.
AT SELECTION-SCREEN OUTPUT.
  LOOP AT SCREEN.
    IF show_all <> 'X' AND
       screen-group1 = 'BL2'.
       screen-active = '0'.
    ENDIF.
    MODIFY SCREEN.
  ENDLOOP.
But,am getting an error message saying "Enter all required fields"
Pls. let me know how to fix this?
Thank you

Answer 1

I assume P1, P2 and P3 are marked as obligatory.
You cannot achieve that. But here is an alternative to achieve a similar functionality.
AT SELECTION-SCREEN.
  CHECK sy-ucomm EQ 'ONLI' OR sy-ucomm = 'SJOB' OR sy-ucomm = 'PRIN'.
  IF p1 is INITIAL or P2 is INITIAL or P3 is INITIAL.
    MESSAGE 'Enter all required fields' TYPE 'E'.
  ENDIF.
AT SELECTION-SCREEN OUTPUT.
  LOOP AT SCREEN.
    IF show_all = 'X' AND
       screen-group1 = 'BL2'.
      screen-input = '0'.
    ENDIF.
    MODIFY SCREEN.
  ENDLOOP.