Hello? Any clues?????
Not sure about JBoss 2.x, within 3.x I think the call will be optimised so that it is local for both interfaces (The reason I am a little vague is because another user on here performed some profiling that seemed to sugest the calls were going remotely but I don't know all the details of their tests).
It is however good practice to just use Local interfaces for entity beans to stop external clients manipulating them directly, also Local interfaces are required if you want CMR.