Select annidata con cast

ls_bukrs = 'IEQ'.
AUTHORITY-CHECK OBJECT 'F_BKPF_BUK'
                    ID 'BUKRS' FIELD gs_table-bukrs
                    ID 'ACTVT' FIELD '03'.
IF sy-subrc = 0.
  SELECT SINGLE kostl,                         "#EC CI_SEL_NESTED
                waers,
                wrbtr
    FROM zvim_wf_det_blkv
   WHERE bukrs = @gs_table-bukrs
     AND belnr = @gs_table-belnr
     AND gjahr = @gs_table-gjahr
     AND buzei IN (
         SELECT CAST( RIGHT( wi_text, 3 ) AS NUMC( 3 ) ) AS buzei
           FROM swwwihead
          WHERE wi_id = @gs_worklist-wi_chckwi )
    INTO (@gs_table-kostl,
          @gs_table-waers,
          @gs_table-wrbtr).
  SELECT ktext                                 "#EC CI_SEL_NESTED
   UP TO 1 ROWS
    FROM cskt
    INTO gs_table-ktext
   WHERE spras = sy-langu
     AND kokrs = 'BENG'
     AND kostl = gs_table-kostl
   ORDER BY datbi DESCENDING.
  ENDSELECT.
ELSE.
  ls_bukrs-low = gs_table-bukrs.
  COLLECT ls_bukrs INTO lr_bukrs.
ENDIF.
IF lr_bukrs[] IS INITIAL.
  ls_bukrs-low = 'XX'.
  APPEND ls_bukrs TO lr_bukrs.
ENDIF.