INTERFACE {{p}}if_watch_order PUBLIC.
  TYPES ty_order_id TYPE c LENGTH 10.
  TYPES ty_customer TYPE c LENGTH 20.
  TYPES ty_status TYPE c LENGTH 1.
  TYPES:
    BEGIN OF ty_order,
      order_id     TYPE ty_order_id,
      customer     TYPE ty_customer,
      duration_min TYPE i,
      status       TYPE ty_status,
    END OF ty_order.
  TYPES tt_orders TYPE STANDARD TABLE OF ty_order WITH EMPTY KEY.
  TYPES:
    BEGIN OF ty_customer_total,
      customer  TYPE ty_customer,
      total_min TYPE i,
    END OF ty_customer_total.
  TYPES tt_customer_totals TYPE STANDARD TABLE OF ty_customer_total WITH EMPTY KEY.
  CONSTANTS:
    BEGIN OF c_status,
      open   TYPE ty_status VALUE 'O',
      closed TYPE ty_status VALUE 'C',
    END OF c_status.
  METHODS merge_orders
    IMPORTING it_intake        TYPE tt_orders
              it_workshop      TYPE tt_orders
    RETURNING VALUE(rt_merged) TYPE tt_orders.
  METHODS open_orders
    IMPORTING it_orders      TYPE tt_orders
    RETURNING VALUE(rt_open) TYPE tt_orders.
  METHODS customer_totals
    IMPORTING it_orders        TYPE tt_orders
    RETURNING VALUE(rt_totals) TYPE tt_customer_totals.
  METHODS find_order
    IMPORTING it_orders       TYPE tt_orders
              iv_order_id     TYPE ty_order_id
    RETURNING VALUE(rs_order) TYPE ty_order.
ENDINTERFACE.