W: No list defined for Bin (EWM)

Hi experts.

I don't know why the list not defined. I need to pull up a list of storage bin. I used the LAGP table. But the list is unfortunately not defined.

Tell me what I did wrong.

FUNCTION ztest_sb_change_pbo.
*"----------------------------------------------------------------------
*"*"Local Interface:
*"  CHANGING
*"     REFERENCE(RESOURCE) TYPE  /SCWM/S_RSRC
*"----------------------------------------------------------------------

  DATA: ls_stbin TYPE lagp,
        ls_rsrc  TYPE /scwm/rsrc.
  DATA: lt_stbin TYPE TABLE OF lagp.

  IF resource IS INITIAL.
    CALL FUNCTION '/SCWM/RSRC_RESOURCE_MEMORY'
      EXPORTING
        iv_uname = sy-uname
      CHANGING
        cs_rsrc  = ls_rsrc.
    MOVE-CORRESPONDING ls_rsrc TO resource.
  ENDIF.

  SELECT * FROM lagp INTO TABLE lt_stbin
              WHERE lgnum = ls_rsrc-lgnum.

  CALL METHOD /scwm/cl_rf_bll_srvc=>init_listbox
    EXPORTING
      iv_fieldname = '/SCWM/S_RF_INQ_ST_BIN-LGPLA'.

  LOOP AT lt_stbin INTO ls_stbin.
    CALL METHOD /scwm/cl_rf_bll_srvc=>insert_listbox
      EXPORTING
        iv_fieldname = '/SCWM/S_RF_INQ_ST_BIN-LGPLA'
        iv_value     = ls_stbin-lgpla.
  ENDLOOP.

ENDFUNCTION.