INTERFACE {{p}}if_discount PUBLIC.
  TYPES ty_group TYPE c LENGTH 1.
  TYPES ty_percent TYPE p LENGTH 5 DECIMALS 2.
  CONSTANTS:
    c_group_key      TYPE ty_group VALUE 'A',
    c_group_standard TYPE ty_group VALUE 'S'.
  METHODS calculate
    IMPORTING iv_quantity       TYPE i
              iv_group          TYPE ty_group
    RETURNING VALUE(rv_percent) TYPE ty_percent.
ENDINTERFACE.