AAE_IDOC between ABAP 7.40 system and PI 7.30
Currently we are facing a problem with a partner who upgraded a ERP system to SAP Basis 7.40 while PI is still running on 7.30.
Now they try to connect this system to PI 7.30 with the java Idoc adapter, as is working in other systems not yet upgraded.
Normally PI should have the highest release in the landscape (note 1043047) but since we/they are not using new functionality I would have expected it to work.
The error we are getting is Connection factory for <AAE_IDOC receiver channel> is null.
Now this could be a configuration error I expect but sofar we have not been able to find it.
What do you think, is the 740-730 connection a definite no-go or should it work?