FUNCTION {{p}}toll_fee
  IMPORTING
    iv_distance_km  TYPE decfloat34
    iv_weight_class TYPE i
    iv_axles        TYPE i
  EXPORTING
    ev_fee          TYPE decfloat34
  EXCEPTIONS
    invalid_input.

  TRY.
      ev_fee = NEW {{p}}toll_calc( )->calculate(
        iv_distance_km  = iv_distance_km
        iv_weight_class = iv_weight_class
        iv_axles        = iv_axles ).
    CATCH cx_abap_invalid_value.
      RAISE invalid_input.
  ENDTRY.

ENDFUNCTION.