Error Message in RWB for Receiver JDBC

Question

Hi Everyone,
We are getting the following error with Receiver JDBC scenario:
Received XI System Error. ErrorCode: NO_BACK_SYSTEM_IN_HOPLIST ErrorText:   ErrorStack: Legacy system to which acknowledgment message is to be sent is missing in hoplist (with wasread=false)
Transmitting the message to endpoint http://server:8010/sap/xi/engine?type=entry using connection JDBC_http://sap.com/xi/XI/System failed, due to: com.sap.aii.af.ra.ms.api.RecoverableException: NO_BACK_SYSTEM_IN_HOPLIST:.
what could be the possible reasons?

Answer 1

Hi ,
<b>Request Messages</b>
The request message contains an acknowledgment tag, which specifies the event for which an acknowledgment is expected. This tag must be specified by the sender (or a sender adapter that supports acknowledgment messages).
                  Message processing in SAP Exchange Infrastructure ensures that the acknowledgment message follows the same route from the receiver to the sender as the request message did from the sender to the receiver. For this purpose, the request message contains a <b>hop list</b> that logs the route of the request message. This information is provided by all Integration Engines and Integration Servers that are involved in the processing of the request message.
<b>Acknowledgment Message</b>
As soon as the request message processing encounters an event that requires an acknowledgment, a corresponding acknowledgment message is created and sent to the sender.
                    An acknowledgment message receives a new message ID, but also has a reference to the message ID of the request message as well as the value Response in the Directory tag of the message header. The request message hop list is copied to the acknowledgment message header, thus enabling backward routing of the acknowledgment message.
        The poosible reason for the error you got ,might be due to you have not defined a particular sender port and client which acknowledgments are requested from the sender. OR configuration parameter has not been set in the respective catagory.
<b>Probale Solution:</b>
1-- You can use Acknowledgments function to define the acknowledgments you want to request for a sender port and client by using function <b>Configuring Acknowledgment Requests</b> :
   a)In the ABAP Editor (transaction SE38), under Program, enter IDX_NOALE and choose  Execute.
   b)Enter a sender port and client.
   c)Decide whether acknowledgments are to be requested or not for the sender port and client. Choose either Request Acknowledgment or Do Not Request Acknowledgment.
The acknowledgments that can be requested are system error acknowledgments, application acknowledgments, and application error acknowledgments.
    d)To display all message types that are sent using the selected sender port and client, in the Exception List frame, select Display Entries followed by  Execute.
    e)If you want to define a different rule for a specific message type, in the Exception List frame, select Insert Message Type or Delete Message Type.
    f) Select the relevant message type and choose  Execute.
2-- You can change the configuration parameter by following the link:
http://help.sap.com/saphelp_nw04/helpdata/en/89/b5553bf3a76258e10000000a114084/content.htm
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Regards,
Jyoti