INTERFACE {{p}}if_salon_price PUBLIC.
  TYPES ty_service TYPE c LENGTH 10.
  TYPES ty_amount TYPE p LENGTH 8 DECIMALS 2.
  CONSTANTS:
    BEGIN OF c_service,
      cut    TYPE ty_service VALUE 'CUT',
      colour TYPE ty_service VALUE 'COLOUR',
      perm   TYPE ty_service VALUE 'PERM',
    END OF c_service.
  METHODS price
    IMPORTING iv_service      TYPE ty_service
              iv_child        TYPE abap_bool
    RETURNING VALUE(rv_price) TYPE ty_amount.
ENDINTERFACE.