Java-based IDOC adapter (idoc_AAE) on PI 7.3 - error

Hello experts,

I created a simple file-to-idoc scenario using a receiver idoc adapter on our java-only SAP PI 7.3 system. Now, I get this error:

IDoc: Error while processing the received messagecom.sap.aii.af.idoc.exception.IDOCAdapterException: IDoc: Connection Factory name for channel <communication channel name> is null

I looked around on SDN and the Service Marketplace, but didn't find anything.

All help is appreciated.

Thanks a lot.

Dimitri