File to Web Service - No back system in hoplist

Hi guys
I've implemented a File to Web service Scenario with XI. The file is picked up from the server.
The message monitoring in the Runtime Workbench shows the following error:
"XI-Systemfehler erhalten. 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)"
Has anybody a clue?

Hi Gokhan,
please go thru the links below and see if u have followed the steps mentioned in it while defining the web service..if it still doesnt help you, pleease do let me know.
http://help.sap.com/saphelp_erp2004/helpdata/en/31/daa0404dd52b54e10000000a1550b0/content.htm
/people/siva.maranani/blog/2005/09/03/invoke-webservices-using-sapxi
/people/david.burdett/blog/2005/01/28/why-using-web-services-for-b2b-is-hard-to-do
/people/dj.adams/blog/2004/06/24/forget-soap--build-real-web-services-with-the-icf
/people/renald.wittwer/blog/2005/01/05/develop-a-web-service-that-sends-an-email
I hope the info provided will help you to atleast some extent solve your problem.
Regards,
abhy

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