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You can use the interface /IWFND/IF_MGW_BEC_API to implement a custom logic for executing the backend API. It is not always necessary to use BOPs in the SAP Gateway OData Channel.

Note

You can implement the interface /IWFND/IF_MGW_BEC_API in the following cases:

  • For simple backend calls if the data types required for the backend calls are available in the SAP Gateway OData Channel.

  • Even in complex scenarios if the data types required for the backend calls are available in the SAP Gateway OData Channel.

The implemented interface (/IWFND/IF_MGW_BEC_API) can be registered in the method REGISTER_MAPPING_SPECIALIST of the EDP with mapping specialist attribute bop_type as /IWFND/IF_MGW_BEC_BOP=>GC_BOP_TYPE_CUSTOM.

Sample code for Execute Action:

DATA:
        ls_bookingdata  TYPE bapisbdeta,
        lv_destination  TYPE string,
        lv_airlineid    TYPE bapisbdeta-carrid,
        lv_booking      TYPE bapisbdeta-bookid,
        ls_booking      TYPE bapisbdeta,
        ls_book_attr    TYPE /iwfnd/om_mgw_sample_sflight_s=>booking_fields,
        lv_flightdate   TYPE bapisbdeta-fldate,
        lv_cust         TYPE bapisbdeta-customid,
        lv_connid       TYPE bapisbdeta-connid,
        ls_return       TYPE bapiret2,
        lt_return       TYPE bapiret2_t,
        lv_exc_msg      TYPE /iwfnd/bec_rfc_exception_text,
        ls_parameter    LIKE LINE OF is_action_params-parameters.
  FIELD-SYMBOLS : <fs> TYPE any.
mv_system_alias = iv_system_alias.
* Get RFC Destination for System Alias
  lv_destination = get_destination( ).
  IF is_action_params IS SUPPLIED.
    CASE is_action_params-action_name.
      WHEN 'cancelbooking'.
        LOOP AT is_action_params-parameters INTO ls_parameter.
          CASE ls_parameter-name.
            WHEN 'airlineid'.
              lv_airlineid = ls_parameter-value.
            WHEN 'bookingnumber'.
              lv_booking   = ls_parameter-value.
            WHEN 'connectid'.
              lv_connid = ls_parameter-value.
            WHEN 'flightdate'.
              lv_flightdate = ls_parameter-value.
          ENDCASE.
        ENDLOOP.
*       Cancel Booking
        CALL FUNCTION 'BAPI_SBOOK_CANCEL' DESTINATION lv_destination
          EXPORTING
            airlinecarrier        = lv_airlineid
            connectionnumber      = lv_connid
            dateofflight          = lv_flightdate
            bookingnumber         = lv_booking
            customernumber        = lv_cust
          IMPORTING
            bookingdata           = ls_booking
            return                = ls_return
          EXCEPTIONS
            system_failure        = 1000  MESSAGE lv_exc_msg
            communication_failure = 1001
            OTHERS                = 1002.
     
          IF sy-subrc EQ 1000.
            RAISE EXCEPTION TYPE /iwfnd/cx_mgw_tech_exception
              EXPORTING
                textid              = /iwfnd/cx_mgw_tech_exception=>rfc_system_error
                rfc_failure_message = lv_exc_msg.
          ELSEIF sy-subrc EQ 1001.
            RAISE EXCEPTION TYPE /iwfnd/cx_mgw_tech_exception
              EXPORTING
                textid              = /iwfnd/cx_mgw_tech_exception=>rfc_communication_error
                rfc_failure_message = lv_exc_msg.
          ELSEIF ls_return IS NOT  INITIAL.
*           Error Handling
            APPEND ls_return TO lt_return.
            io_context->get_message_container( )->add_message(
                                                  iv_msg_text = ls_return-message
                                                  iv_msg_number = ls_return-number
                                                  iv_msg_id = ls_return-id
                                                  iv_msg_type = 'E'
                                                  iv_system_alias  = mv_system_alias
                                                  iv_entity_type   = iv_entity_name
                                                  iv_message_creator = 'TEST_AGENT' ).
            ev_process_code = /iwfnd/if_mgw_bop_map=>cs_process_code-stop_processing.
          ENDIF.
    ENDCASE.

 ENDIF.

Sample code for Registration:

CASE iv_entity_name.
         WHEN 'flight'.
         CASE iv_entity_operation.
         WHEN gc_operation_code_wr-execute_action.
         ls_mapping_specialist_attr-execution_mode = gc_operation_code_wr-execute_action.
         ls_mapping_specialist_attr-bop_type = /iwfnd/if_mgw_bec_bop=>gc_bop_type_custom.
         CREATE OBJECT ls_mapping_specialist_attr-be_api_ref TYPE ZCL_FLIGHT_BOOK_CANCEL.
         APPEND ls_mapping_specialist_attr TO et_mapping_specialist_attr.          
ENDCASE.
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