INTERFACE {{p}}if_stock_cover PUBLIC.
  TYPES ty_material TYPE c LENGTH 18.
  TYPES ty_plant    TYPE c LENGTH 4.
  TYPES ty_quantity TYPE p LENGTH 13 DECIMALS 3.
  TYPES ty_status   TYPE c LENGTH 10.

  TYPES: BEGIN OF ty_stock_item,
           material TYPE ty_material,
           plant    TYPE ty_plant,
           quantity TYPE ty_quantity,
         END OF ty_stock_item.
  TYPES tt_stock_item TYPE STANDARD TABLE OF ty_stock_item WITH EMPTY KEY.

  TYPES: BEGIN OF ty_requirement,
           material TYPE ty_material,
           plant    TYPE ty_plant,
           required TYPE ty_quantity,
         END OF ty_requirement.
  TYPES tt_requirement TYPE STANDARD TABLE OF ty_requirement WITH EMPTY KEY.

  TYPES: BEGIN OF ty_result,
           material  TYPE ty_material,
           plant     TYPE ty_plant,
           required  TYPE ty_quantity,
           available TYPE ty_quantity,
           shortage  TYPE ty_quantity,
           status    TYPE ty_status,
         END OF ty_result.
  TYPES tt_result TYPE STANDARD TABLE OF ty_result WITH EMPTY KEY.

  CONSTANTS:
    BEGIN OF c_status,
      ok      TYPE ty_status VALUE 'OK',
      short   TYPE ty_status VALUE 'SHORT',
      invalid TYPE ty_status VALUE 'INVALID',
    END OF c_status.

  METHODS check
    IMPORTING it_stock         TYPE tt_stock_item
              it_requirement   TYPE tt_requirement
    RETURNING VALUE(rt_result) TYPE tt_result.

  METHODS shortages
    IMPORTING it_result          TYPE tt_result
    RETURNING VALUE(rt_shortage) TYPE tt_result.
ENDINTERFACE.