INTERFACE {{p}}if_freight_calc PUBLIC.
  TYPES ty_reason TYPE c LENGTH 10.
  TYPES ty_amount TYPE p LENGTH 9 DECIMALS 2.
  TYPES ty_weight TYPE p LENGTH 9 DECIMALS 3.
  TYPES ty_volume TYPE p LENGTH 9 DECIMALS 3.
  TYPES ty_distance TYPE i.
  TYPES ty_fuel TYPE p LENGTH 5 DECIMALS 1.

  CONSTANTS:
    BEGIN OF c_reason,
      ok       TYPE ty_reason VALUE 'OK',
      weight   TYPE ty_reason VALUE 'WEIGHT',
      volume   TYPE ty_reason VALUE 'VOLUME',
      distance TYPE ty_reason VALUE 'DISTANCE',
      fuel     TYPE ty_reason VALUE 'FUEL',
    END OF c_reason.

  TYPES:
    BEGIN OF ty_result,
      chargeable_weight TYPE ty_weight,
      base              TYPE ty_amount,
      distance          TYPE ty_amount,
      fuel              TYPE ty_amount,
      total             TYPE ty_amount,
      reason            TYPE ty_reason,
    END OF ty_result.

  METHODS calculate
    IMPORTING iv_weight_kg     TYPE ty_weight
              iv_volume_m3     TYPE ty_volume
              iv_distance_km   TYPE ty_distance
              iv_fuel_index    TYPE ty_fuel
    RETURNING VALUE(rs_result) TYPE ty_result.
ENDINTERFACE.