SAP: BAPI Delete BOM

LOOP AT T_MAST.
  W_LOOP = SY-TABIX.
  CALL FUNCTION 'CSAP_MAT_BOM_DELETE'
    EXPORTING
      MATERIAL                 = T_MAST-MATNR
      PLANT                    = T_MAST-WERKS
      BOM_USAGE                = P_STLAN
*   ALTERNATIVE              =
*   VALID_FROM               =
*   CHANGE_NO                =
*   REVISION_LEVEL           =
*   FL_NO_CHANGE_DOC         = ' '
*   FL_COMMIT_AND_WAIT       = ' '
* IMPORTING
*   FL_WARNING               =
* EXCEPTIONS
*   ERROR                    = 1
*   OTHERS                   = 2
            .
  IF SY-SUBRC <> 0.
     W_ERR = W_ERR + 1.
     T_ERROR-WERKS = T_MAST-WERKS.
     T_ERROR-MATNR = T_MAST-MATNR.
     APPEND T_ERROR.
  ELSE.
    W_CNT = W_CNT + 1.
    T_MAST-FLAG = 'Y'.
    MODIFY T_MAST INDEX W_LOOP.
  ENDIF.
  SY-TABIX = W_LOOP.
ENDLOOP.