How to hide/show ABAP selection screen fields

With a little keebler magic, you can turn on/off (hide/show) fields on your program's selection screen. This makes...

your program dynamic to the user's input.

The ABAP code was written in 4.6B and should work on all live versions of R/3.

Define your parameter or selection-option field like so using the addition MODIF:

SELECT-OPTIONS s_pltyp FOR a606-pltyp NO INTERVALS NO-EXTENSION

MODIF ID prc.

In your code, this could be your logic:

AT SELECTION-SCREEN OUTPUT.

* User clicks the checkbox 'pipe'
  IF NOT pipe IS INITIAL.
* Don't allow input for these fields
    LOOP AT SCREEN.
      CASE screen-group1.
        WHEN 'PRC'.
          screen-input = '0'.
          screen-output = '0'.
          screen-invisible = '1'.
          MODIFY SCREEN.
      ENDCASE.
    ENDLOOP.
  ENDIF.