Enhanced receiver determination, mapping failed

Hi experts,

I am facing this issue with the AEX system.

scenario 1:N mapping, the Sender file adapter is to poll from a NFS dir. and the ping is successful with binding existence as well, but thr is no msg formed and following error is thrown directly:

Error: com.sap.aii.adapter.xi.routing.RoutingException: Error while executing receiver determination mapping.

I've run this scenario as 1:1 and it works fine with the same source file etc.

I've gone thru: Extended Receiver Determination in Integrated Configuration failing and few other posts but all are expecting the source message somehow, before this error.

Plz help.

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rgds