Add messages in Odata services

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 *1. Instatiate the Message Container

    DATA: lo_message_container TYPE REF TO /iwbep/if_message_container.

    CALL METHOD me->/iwbep/if_mgw_conv_srv_runtime~get_message_container
      RECEIVING
        ro_message_container = lo_message_container.

    CALL METHOD lo_message_container->add_message
      EXPORTING
        iv_msg_type               = /iwbep/cl_cos_logger=>warning
        iv_msg_id                 = 'ZTEST'
        iv_msg_number             = '000'
        iv_add_to_response_header = abap_true. "add the message to the header
********************************ROHINI KUMAR*********************************
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