INTERFACE {{p}}if_air_freight PUBLIC.
  TYPES:
    ty_weight   TYPE p LENGTH 9 DECIMALS 3,
    ty_volume   TYPE p LENGTH 11 DECIMALS 3,
    ty_amount   TYPE p LENGTH 13 DECIMALS 2,
    ty_category TYPE c LENGTH 10,
    ty_reason   TYPE c LENGTH 12.

  TYPES:
    BEGIN OF ty_result,
      chargeable_weight TYPE ty_weight,
      freight           TYPE ty_amount,
      dangerous_fee     TYPE ty_amount,
      fuel_fee          TYPE ty_amount,
      security_fee      TYPE ty_amount,
      total_amount      TYPE ty_amount,
      reason            TYPE ty_reason,
    END OF ty_result.

  CONSTANTS:
    BEGIN OF c_category,
      general    TYPE ty_category VALUE 'GENERAL',
      perishable TYPE ty_category VALUE 'PERISHABLE',
      valuable   TYPE ty_category VALUE 'VALUABLE',
    END OF c_category.

  CONSTANTS:
    BEGIN OF c_reason,
      ok           TYPE ty_reason VALUE 'OK',
      bad_weight   TYPE ty_reason VALUE 'BAD_WEIGHT',
      bad_volume   TYPE ty_reason VALUE 'BAD_VOLUME',
      bad_category TYPE ty_reason VALUE 'BAD_CATEGORY',
      too_heavy    TYPE ty_reason VALUE 'TOO_HEAVY',
    END OF c_reason.

  METHODS price
    IMPORTING iv_weight    TYPE ty_weight
              iv_volume    TYPE ty_volume
              iv_category  TYPE ty_category
              iv_dangerous TYPE abap_bool
    RETURNING VALUE(rs_result) TYPE ty_result.
ENDINTERFACE.