INTERFACE {{p}}if_tool_hire PUBLIC.
  TYPES ty_tool TYPE c LENGTH 1.
  TYPES ty_days TYPE i.
  TYPES ty_amount TYPE p LENGTH 13 DECIMALS 2.
  TYPES ty_reason TYPE c LENGTH 12.
  TYPES:
    BEGIN OF ty_result,
      fee    TYPE ty_amount,
      reason TYPE ty_reason,
    END OF ty_result.
  CONSTANTS:
    BEGIN OF c_reason,
      ok           TYPE ty_reason VALUE 'OK',
      unknown_tool TYPE ty_reason VALUE 'UNKNOWN_TOOL',
      too_short    TYPE ty_reason VALUE 'TOO_SHORT',
    END OF c_reason.
  METHODS calculate
    IMPORTING iv_tool          TYPE ty_tool
              iv_days          TYPE ty_days
    RETURNING VALUE(rs_result) TYPE ty_result.
ENDINTERFACE.