#ABAP code to calculate the #tax from a gross amount. The example here calculates any non-deductible tax from a gross amount. Its used by the ZCL_PURCHASE_ORDER_STATUS class. Interestingly non-deductible tax is added to the amount shown as DELIVERED in the PO status screen (ME23N) which is confusing as the other amount such as PO ordered amount …

get_non_ded_tax_po_item.abap

  method get_non_ded_tax_po_item.
    data: tax_code type mwskz,
          company_code type bukrs,
          currency type waers,
          tax_jurisdiction type txjcd,
          gross_amount type wrbtr.


    select single bukrs waers into (company_code, currency)
      from ekko
      where ebeln = po.

    check sy-subrc = 0.

    select single mwskz txjcd into (tax_code, tax_jurisdiction)
      from ekpo
      where ebeln = po
        and ebelp = item.

    check sy-subrc = 0.

    gross_amount = value. "type conversion

    call function 'CALCULATE_TAX_FROM_GROSSAMOUNT'
      exporting
        i_bukrs                 = company_code
        i_mwskz                 = tax_code
        i_txjcd                 = tax_jurisdiction
        i_waers                 = currency
        i_wrbtr                 = gross_amount
      importing
        e_fwnav                 = non_deductible_tax    " Non-deductible tax calculated (total)
      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.
      non_deductible_tax = 0.
    endif.
  endmethod.                    "get_non_ded_tax_po_item