Hi Eng,
The log is right because adapter receive the response from SAP system and trying to send the response message back to integration engine for processing after ResponseOneWayBean adapter module.
wrong response:
04/12/2016 11:11:22.728 Information SOAP: continued from request message 11111111-1111-1111-1111-1111111111111
04/12/2016 11:11:22.730 Information SOAP: response message leaving the adapter
04/12/2016 11:11:22.745 Information ROB: entering ResponseOnewayBean
04/12/2016 11:11:22.747 Information ROB: resuming the transaction
04/12/2016 11:11:22.750 Information ROB: sending to the messaging system ...
04/12/2016 11:11:22.751 Information The application tries to send an XI message asynchronously using connection AFW.
04/12/2016 11:11:22.772 Information Trying to put the message into the send queue.
04/12/2016 11:11:23.500 Information MP: leaving
04/12/2016 11:11:23.500 Information Message successfully put into the queue.
04/12/2016 11:11:23.500 Information ROB: leaving ResponseOnewayBean
04/12/2016 11:11:23.500 Information ROB: returned with no response
04/12/2016 11:11:23.500 Information The application sent the message asynchronously using connection AFW. Returning to application.
04/12/2016 11:11:23.766 Information The message was successfully retrieved from the send queue.
04/12/2016 11:11:24.179 Information The message status was set to DLNG.
04/12/2016 11:11:24.417 Error Received XI System Error. ErrorCode: LOOP_IN_MESSAGE_ROUTING ErrorText: null ErrorStack: Loop in message flow found: system is.81.PI_SYSTEM, pipeline CENTRAL with inbound adapter XI already processed (see hoplist header)
Regards,
Praveen.