Http to file scenario generate "Acknowledgement not possible"?

Hi.
On PI7.1 we built a http to file scenario and used the RWB "Test message" functionality to test the interface.
Now we get a "Acknowledgement not possible" in sxmb_moni. How can we switch this off.
thanks

Hi
while sending request use either EO or EOIO for Asynch.
EO and EOIO, processing occurs asynchronously and the client only receives a confirmation of receipt with HTTP status u2018200u2019.
Read this
http://help.sap.com/saphelp_nw04/helpdata/en/43/64db4daf9f30b4e10000000a11466f/content.htm

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