Weblogic's relations trouble

[Max Voronoy]

Hi colleagues!
I have two beans (A & B) with relation one-A-to-many-B. Remote client tries to get collection of B with call A_instance.getBs(). And there I've got exception in A's stub class:
Collections managed by the CMP RDBMS persistence manager may not be passed directly to a remote client.
What does it mean. How this can be resolved.
Any suggestion will be helpfull