Problem in getting parameter value from selection screen in web dynpro abap

Hi,
I am facing problem in getting parameter value from selection screen.
Please find my code below:
DATA LT_PAR_ITEM TYPE IF_WD_SELECT_OPTIONS=>TT_SELECTION_SCREEN_ITEM.
FIELD-SYMBOLS:<FS_PAR_ITEM> LIKE LINE OF LT_PAR_ITEM,
                             <FS_OBJ_USAGE>    TYPE REF TO data.
  WD_THIS->M_HANDLER->GET_PARAMETER_FIELDS( IMPORTING ET_FIELDS = LT_PAR_ITEM ).
  LOOP AT LT_PAR_ITEM ASSIGNING <FS_PAR_ITEM>.
    CASE <FS_PAR_ITEM>-M_ID.
      WHEN `OBJ_USAGE`.
         ASSIGN <FS_PAR_ITEM>-M_VALUE->* TO <FS_OBJ_USAGE>.      
[ Here, sy-subrc is 4,  <FS_OBJ_USAGE> is not assigning.]
    ENDCASE.
  ENDLOOP. 
So, can any one solve this problem.
Thanks in advance,
Radhika

Hi Radhika,
Try using GET_RANGE_TABLE_OF_SEL_FIELD...
Please Refer below code..
   DATA: NODE_FLIGHTS TYPE REF TO IF_WD_CONTEXT_NODE.
  DATA: RT_CARRID TYPE REF TO DATA.
  DATA: ISFLIGHT TYPE TABLE OF SFLIGHT.
  DATA: WSFLIGHT TYPE SFLIGHT.
  FIELD-SYMBOLS: <FS_CARRID> TYPE TABLE.
Retrieve the data from the select option
  RT_CARRID = WD_THIS->M_HANDLER->GET_RANGE_TABLE_OF_SEL_FIELD( I_ID = 'S_CARR_ID' ).
Assign it to a field symbol
  ASSIGN RT_CARRID->* TO <FS_CARRID>.
  CLEAR ISFLIGHT. REFRESH ISFLIGHT.
  SELECT * INTO CORRESPONDING FIELDS OF TABLE ISFLIGHT FROM SFLIGHT
                       WHERE CARRID IN <FS_CARRID>.
  NODE_FLIGHTS = WD_CONTEXT->GET_CHILD_NODE( NAME = `FLIGHTS` ).
  NODE_FLIGHTS->BIND_ELEMENTS( ISFLIGHT ).
Thanks,
Regards,
Kiran

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