Set selected popin

Hi,
I am assigning this way the selected popin to my table:
lr_table->set_selected_popin( value = 'ALVTABLE.TAB_EMPLOYEES.SELECTED_POPIN' ).
ALVTABLE is my view
TAB_EMPLOYEES is a table in my context node
SELECTED_POPIN in a field in the above table
when I run the application I get a short dump of type OBJECTS_OBJREF_NOT_ASSIGNED and the protocol tells me that I try to access a NULL object.
where is the problem ??

Hi,
i have seen this code working in a action handler.
context_element, id are the event parameters in the action handler method.
data view type ref to if_wd_view.
  data wd_table type ref to cl_wd_table.
  data wd_element type ref to cl_wd_view_element.
  data node type ref to if_wd_context_node.
  node = context_element->get_node( ).
  node->set_lead_selection( context_element ).
  node->clear_selection( ).
  view ?= wd_this->wd_get_api( ).
  wd_table ?= view->get_element( 'TABLE' ).
  wd_element ?= view->get_element( id ).
  wd_table->set_selected_popin( wd_element->_parent->id ).

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    when select 1st option , show group1 screen
    when select 2nd option, show group2 screen
    like the follow ..which is pretty work!....but i have another question that how to set the screen field ..
    my question is that if i select group1 screen...i want to set
    if S1_EBELN = '' and S1_IHREZ = ''.
        message e398 with 'pls input one of these two options!'.
      elseif S1_EBELN ne '' and S1_IHREZ ne ''.
        message e398 with 'Only one of these two options input is allowed&#65281;'.
      endif.
    i've tried to insert these statement within the LOOP...but not work ......
    so can anyone know how to set?
    PARAMETERS:
    R1 RADIOBUTTON GROUP OPT1 USER-COMMAND R DEFAULT 'X'.
    PARAMETERS:
    R2 RADIOBUTTON GROUP OPT1.
    SELECTION-SCREEN BEGIN OF BLOCK RPT1 WITH FRAME TITLE TEXT-001.
    SELECTION-SCREEN SKIP 1.
    SELECT-OPTIONS: S1_BUKRS FOR EKKO-BUKRS MODIF ID ABC. 
    SELECT-OPTIONS: S1_EBELN FOR EKKO-EBELN MODIF ID ABC . 
    SELECT-OPTIONS: S1_IHREZ FOR EKKO-IHREZ MODIF ID ABC .  
    SELECTION-SCREEN END OF BLOCK RPT1.
    SELECTION-SCREEN BEGIN OF BLOCK RPT2 WITH FRAME TITLE TEXT-001.
    SELECTION-SCREEN SKIP 1.
    SELECT-OPTIONS:  S2_BUKRS FOR EKKO-BUKRS MODIF ID DEF.
    SELECT-OPTIONS: S2_MBLNR FOR MKPF-MBLNR MODIF ID DEF.   
    SELECT-OPTIONS: S2_XBLNR FOR MKPF-XBLNR MODIF ID DEF .   
    SELECTION-SCREEN END OF BLOCK RPT2.
    IF R1 = 'X'.
        LOOP AT SCREEN.
          IF screen-group1 = 'DEF'.
            screen-input = '1'.
            SCREEN-required = '1'.
            SCREEN-INVISIBLE = '1'.
            screen-input = '0'.
            screen-output = '1'.
            screen-active = '0'.
            MODIFY SCREEN.
          ENDIF.
        ENDLOOP.
    ELSEIF R2 = 'X'.
        LOOP AT SCREEN.
          IF screen-group1 = 'ABC' .
            screen-active = '0'.
            screen-input = '0'.
            screen-output = '1'.
            MODIFY SCREEN.
          ENDIF.
        ENDLOOP.
      ENDIF.

    Modified ur code .
    tables : ekko, mkpf.
    PARAMETERS : R1 RADIOBUTTON GROUP RG USER-COMMAND R DEFAULT 'X'.
    PARAMETERS : R2 RADIOBUTTON GROUP RG .
    SELECTION-SCREEN BEGIN OF BLOCK RPT1 WITH FRAME TITLE TEXT-001.
    SELECTION-SCREEN SKIP 1.
    SELECT-OPTIONS: S1_BUKRS FOR EKKO-BUKRS MODIF ID ABC.
    SELECT-OPTIONS: S1_EBELN FOR EKKO-EBELN MODIF ID ABC .
    SELECT-OPTIONS: S1_IHREZ FOR EKKO-IHREZ MODIF ID ABC .
    SELECTION-SCREEN END OF BLOCK RPT1.
    SELECTION-SCREEN BEGIN OF BLOCK RPT2 WITH FRAME TITLE TEXT-001.
    SELECTION-SCREEN SKIP 1.
    SELECT-OPTIONS: S2_BUKRS FOR EKKO-BUKRS MODIF ID DEF.
    SELECT-OPTIONS: S2_MBLNR FOR MKPF-MBLNR MODIF ID DEF.
    SELECT-OPTIONS: S2_XBLNR FOR MKPF-XBLNR MODIF ID DEF .
    SELECTION-SCREEN END OF BLOCK RPT2.
    at selection-screen output.
    IF R1 = 'X'.
    LOOP AT SCREEN.
    IF screen-group1 = 'DEF' .
    screen-active = '0'.
    MODIFY SCREEN.
    ENDIF.
    ENDLOOP.
    ENDIF.
    IF R2 = 'X'.
    LOOP AT SCREEN.
    IF screen-group1 = 'ABC' .
    screen-active = '0'.
    MODIFY SCREEN.
    ENDIF.
    ENDLOOP.
    ENDIF.
    at selection-screen .
    if r1 = 'X'.
    if s1_ebeln[] is initial and s1_ihrez[] is initial..
    message e001(zxx) with 'pls input one of these two options!'.
    endif.
    if NOT s1_ebeln[] IS initial.
    IF NOT s1_ihrez[] IS INITIAL.
    message e001(zxx) with 'only one entry in Ebeln or Ihrez is
    allowed'.
    ENDIF.
    ENDIF.
    endif.
    START-OF-SELECTION.
    WRITE:/ 'hi'.
    ***add on
    split the text into two texts .
    <b>if NOT s1_ebeln[] IS initial.
    IF NOT s1_ihrez[] IS INITIAL.
    message e001(zxx) with text-001 text-002.
    *'only one entry in Ebeln   = text-001
    or Ihrez is allowed'.       = text-002.</b> 
    regards,
    vijay

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