abap using code definition method, parameters are optional

1: The method defined parameter is optional format is as follows:

 METHODS: handle_travel_messages
      IMPORTING
        iv_cid       TYPE abp_behv_cid   OPTIONAL
        iv_travel_id TYPE /dmo/travel_id OPTIONAL
        it_messages  TYPE /dmo/if_flight_legacy=>tt_message
      CHANGING
        failed       TYPE tt_travel_failed
        reported     TYPE tt_travel_reported.

 

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Origin www.cnblogs.com/liyafei/p/11645930.html