Disable listbox after selecting item.

Hello
I want to disable the listbox after selecting some item from that list..
for example :
first the user select item from the list (at this time listbox is not disable) then after selecting, it should not allow user to change it (so i want to disable it).
I tried "loop at screen" in which i did screen-input = 0. but its not working.
Please help me...
Regards
Virendra

Hi,
TYPE-POOLS vrm.
PARAMETERS : lb TYPE char10 VISIBLE LENGTH 15 AS LISTBOX USER-COMMAND lb.
DATA : vrm_id TYPE vrm_value-text,
          vrm_values TYPE vrm_value OCCURS 0 WITH HEADER LINE.
AT SELECTION-SCREEN OUTPUT.
IF NOT lb IS INITIAL.
    LOOP AT SCREEN.
      IF screen-name = 'LB'.
        screen-input = 0.
"        MODIFY SCREEN. --> You forgot add this Code
" This is a tested piece of Code Just Execute and Check
      ENDIF.
    ENDLOOP.
ENDIF.
LOOP AT SCREEN.
    IF screen-group1 = 'AA' OR
      screen-group1 = 'BB' OR
      screen-group1 = 'CC'.
      screen-invisible = 1.
      screen-active = 0.
      MODIFY SCREEN.
    ENDIF.
ENDLOOP.
REFRESH vrm_values.
vrm_values-key = 'VBELN'.
vrm_values     = 'VBELN'.
APPEND vrm_values.
vrm_values-key = 'MATNR'.
vrm_values     = 'MATNR'.
APPEND vrm_values.
vrm_values-key = 'AUFNR'.
vrm_values     = 'AUFNR'.
APPEND vrm_values.
vrm_id = 'LB'.
CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id              = vrm_id
      values          = vrm_values[]
    EXCEPTIONS
      id_illegal_name = 1
      OTHERS          = 2.
Cheerz
Ram

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