I have created two radiobutton & I have two field where I have to put file path. Whenever I check one radio button I want to only activate only one field and other field should be deactivated. I am trying by using at seelction-screen output. but I'm not getting desired output.

By: Hari

Here is the sample code for your requirement.
  
selection-screen :begin of block test with frame title text-001.
parameters:p_rad1 radiobutton group one user-command test,
                 p_rad2 radiobutton group one.
selection-screen:end of block test.
selection-screen:begin of block test2 with frame title text-002.
parameters:p_file(10) TYPE C MODIF ID TL,
                 p_file1(10) TYPE C MODIF ID TT.
selection-screen:end of block test2.
   
AT SELECTION-SCREEN OUTPUT.
  IF P_RAD1 = 'X'.
      LOOP AT SCREEN.
          CHECK SCREEN-GROUP1 = 'TT'.
          SCREEN-INPUT = '0'.
          MODIFY SCREEN.
      ENDLOOP.
  ENDIF.

  IF P_RAD2 = 'X'.
      LOOP AT SCREEN.
         CHECK SCREEN-GROUP1 = 'TL'.
         SCREEN-INPUT = '0'.
         MODIFY SCREEN.
      ENDLOOP.
  ENDIF.

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