[FI] CALCULATE_TAX_FROM_GROSSAMOUNT

    DATA lt_mwdat TYPE TABLE OF RTAX1U15.

    CALL FUNCTION 'CALCULATE_TAX_FROM_GROSSAMOUNT'
      EXPORTING
        i_bukrs                 = lv_bukrs
        i_mwskz                 = lv_mwskz
*       I_TXJCD                 = ' '
        i_waers                 = lv_waers
        i_wrbtr                 = lv_wrbtr
*     IMPORTING
*       E_FWNAV                 =
*       E_FWNVV                 =
*       E_FWSTE                 =
*       E_FWAST                 =
      TABLES
        t_mwdat                 = lt_mwdat
      EXCEPTIONS
        bukrs_not_found         = 1
        country_not_found       = 2
        mwskz_not_defined       = 3
        mwskz_not_valid         = 4
        account_not_found       = 5
        different_discount_base = 6
        different_tax_base      = 7
        txjcd_not_valid         = 8
        not_found               = 9
        ktosl_not_found         = 10
        kalsm_not_found         = 11
        parameter_error         = 12
        knumh_not_found         = 13
        kschl_not_found         = 14
        unknown_error           = 15
        OTHERS                  = 16.
    IF sy-subrc <> 0 OR lt_mwdat IS INITIAL. 
      RAISE EXCEPTION TYPE zcx_xxx
        EXPORTING
          textid = zcx_xxx=>zcx_xxx
          msgv1  = SWITCH #( sy-subrc
         WHEN 1 THEN 'BUKRS_NOT_FOUND  '
         WHEN 2 THEN 'COUNTRY_NOT_FOUND'
         WHEN 3 THEN 'MWSKZ_NOT_DEFINED'
         WHEN 4 THEN 'MWSKZ_NOT_VALID'
         WHEN 5 THEN 'ACCOUNT_NOT_FOUND'
         WHEN 6 THEN 'DIFFERENT_DISCOUNT_BASE'
         WHEN 7 THEN 'DIFFERENT_TAX_BASE'
         WHEN 8 THEN 'TXJCD_NOT_VALID'
         WHEN 9 THEN 'NOT_FOUND'
         WHEN 10 THEN 'KTOSL_NOT_FOUND'
         WHEN 11 THEN 'KALSM_NOT_FOUND'
         WHEN 12 THEN 'PARAMETER_ERROR'
         WHEN 13 THEN 'KNUMH_NOT_FOUND'
         WHEN 14 THEN 'KSCHL_NOT_FOUND'
         WHEN 15 THEN 'UNKNOWN_ERROR' )
          mtype  = 'E'.
    ENDIF.