Strange ClassCastException when looking up SLSB RemoteHome from "external" .war webapp

Hi,

we are still working on migrating our JOnAS 4.10 based Java EE 1.4 EAR
to JOnAS 5.1.5. One (seems really to be the last) open issue 
we have is the following:

Our Java EE 1.4 Application is packaged as EAR, it contains the
EjB-JAR.JAR containing the EJB 2.1 SLSB's. It also contains 2 or 3
webapps as .WAR file  (war files within the EAR file), which are looking
up the remote homes and remote interfaces of the SLSB's
which works fine.

Then we have another webapp, based on AXIS2 which provides webservices
to external clients. The axis2 war file provies web-services,
which also lookup the Remote Homes and Remote Interfaces of some of the
SLSB's contained in the ear mentioned above. 

Therefore the remote home and remote interface stubs are packaged
as .jar file in web-inf/lib of the axis2.war webapp. 

Basically this is all as it is meant to be by the Java EE standard, this
is what remote home and remote interfaces of EJB's are for, and it
really works fine and smooth on JOnAS 4.10.X

When we now deploy our .EAR file and the axis2.WAR on JOnAS 5.1.5    and
make a test-invocation of the web-service, we get a really strange
ClassCastException:

 Cannot cast
'org.ow2.jonas_gen.com.lbslogics.ims.guardian.interfaces.JOnASGuardian2Bean1797447629Home' in 'com.lbslogics.ims.guardian.interfaces.Guardian2Home'

When I check the source file (JOnASGuardian2Bean1797447629Home)
generated by GenIC, it explicitly says:

public class JOnASGuardian2Bean1797447629Home extends JSessionHome
implements com.lbslogics.ims.guardian.interfaces.Guardian2Home {

    // JOnAS version used to deploy
    public static final String JONAS_VERSION = "5.1.5";

[ ..... ]


======>  so, the cast has to be possible.  (and btw this works fine with
all other .WAR's contained in the EAR itself doing the same).  So why or
what
is the problem here ??? 

Any ideas are appreciated because we cannot migrate our production
servers unless also the webservices are working!

regards,
Hans