DATA gt_oldBOM type table of STPOX.
DATA gs_oldBOM type STPOX.
dATA gt_tab type TABLE OF mast.
dATA gs_tab type mast.


SELECT * FROM MAST
  INTO CORRESPONDING FIELDS OF TABLE GT_TAB
  WHERE matnr in s_matnr AND werks = p_werks.
 call function 'CS_BOM_EXPL_MAT_V2'
    EXPORTING
     CAPID                       = 'PP01'
     DATUV                       =  sy-datum
     EMENG                       = 1
     MKTLS                       = 'X'
     MEHRS                       = 'X'
     MTNRV                       = gs_tab-matnr
     STLAL                       = gs_tab-stlal
     STLAN                       = gs_tab-stlan
     WERKS                       = gs_tab-werks
    tables
      stb                        = gt_oldBOM.
  if sy-subrc = 0.
endif.