Deploy differences between 904 standalone and 903 J2EE and Web cache versio

I am trying to port an application from jboss (3.0.3) to OAS 9iAS rel2. Since the application uses local interfaces in the EJBs, I am using the pre-release versions of OAS. My development environment also include ant and xdoclet. I am not using JDeveloper or TopLink and would prefer not to due to the different targets we are using.
I have successfully portet to the 9.0.4 OC4J (standalone) version. In doing so I have collected all my EJB-class files in one jar, appName-ejb.jar, which along with the war-file and META-INF files go in the ear-file. Attempting to deploy this ear-file directly in 9.0.3 "J2EE and Webcache" version gives me the following error message in the Oracle Enterprise Manager Console: "Deployment failed: Nested exception Root Cause: Syntax error in source. Syntax error in source"
The how-to:Implement Local Interface (cmplocal) also use a single jar-file, cmplocal-ejb.jar. The description is targeted toward OC4J standalone. I have not attempted to deploy this ear-file in the "j2ee and webcache" version.
The Petstore demo ear-file (ref: "O9iAS Containers for J2EE User's Guide (9.0.3)") has all its beans in separate jar-files and deploys without any problems. The documentation also indicate that all beans has to be in separate jar-files in the root of the ear-file i.e this is a requirement. Do I understand the documentation correctly?
Why the difference between the standalone version and the next version? Does not the possibility having to maintain a a large number of bean-jar-files in the root of the ear-file make development/deployment much more difficult than necessary?
Does there exist any batch-workarounds?
Dag

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