10g: Must all related tables be in the same project?

Since we will eventaully have over 500 tables to map, we would like to be able to maintain these tables/classes in different projects. How do we map foreign key references between tables/classes that we would like to maintain in different projects?
I don't know if theis is why I'm getting this error, but I initially created two projects with independent tables. Then I wanted to join some tables in one project to some tables in another project. (This is all using Offline Database Objects.) I dropped some tables managed in project A into the diagram for project B and created the foreign key relations (from B to A.) Now whenever I try to open the TopLink Mappings node for project B in the Navigator, I get the following error. I get this error even if I drop ALL the tables from project A into project B's diagram (meaning there is nothing left in the schema that could be the missing 'parent'.)
Local Exception Stack:
Exception [TOPLINK-98] (Oracle9iAS TopLink - Release 2 (9.0.4.0) (Build 030612)): oracle.toplink.exceptions.DescriptorException
Exception Description: The underlying descriptor callback method [postBuild], with parameter (DescriptorEvent), triggered an exception.
Internal Exception: java.lang.reflect.InvocationTargetException
Target Invocation Exception: java.lang.IllegalStateException: This object is missing a parent: MWTable[C14] (AVEGA.DATAMART)
Descriptor: XMLDescriptor(oracle.toplink.workbench.model.MWProject --> [DatabaseTable(project)])
     at oracle.toplink.exceptions.DescriptorException.<init>(DescriptorException.java:207)
     at oracle.toplink.exceptions.DescriptorException.<init>(DescriptorException.java:212)
     at oracle.toplink.exceptions.DescriptorException.targetInvocationWhileEventExecution(DescriptorException.java:1364)
     at oracle.toplink.publicinterface.DescriptorEventManager.executeEvent(DescriptorEventManager.java:133)
     at oracle.toplink.internal.descriptors.ObjectBuilder.buildAttributesIntoObject(ObjectBuilder.java:179)
     at oracle.toplink.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:331)
     at oracle.toplink.queryframework.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:227)
     at oracle.toplink.queryframework.ReadObjectQuery.execute(ReadObjectQuery.java:344)
     at oracle.toplink.queryframework.DatabaseQuery.execute(DatabaseQuery.java:498)
     at oracle.toplink.queryframework.ReadQuery.execute(ReadQuery.java:111)
     at oracle.toplink.publicinterface.Session.internalExecuteQuery(Session.java:1968)
     at oracle.toplink.publicinterface.Session.executeQuery(Session.java:1096)
     at oracle.toplink.publicinterface.Session.executeQuery(Session.java:1048)
     at oracle.toplink.publicinterface.Session.readObject(Session.java:2502)
     at oracle.toplink.workbench.ui.WorkbenchSession.getMWProjectNamed(WorkbenchSession.java:270)
     at oracle.toplink.addin.persistence.MWJDeveloperPersistence.open(MWJDeveloperPersistence.java:176)
     at oracle.toplink.tsceditor.persistence.PersistenceManager.open(PersistenceManager.java:942)
     at oracle.toplink.addin.manager.MWJDeveloperMediator.openMWProject(MWJDeveloperMediator.java:164)
     at oracle.toplink.addin.manager.MWJDeveloperMediator.locateAndOpenProjectImp(MWJDeveloperMediator.java:626)
     at oracle.toplink.addin.manager.MWJDeveloperMediator.getEditableObjectFor(MWJDeveloperMediator.java:430)
     at oracle.toplink.addin.ui.view.explorer.MWExplorer.updateExplorer(MWExplorer.java:586)
     at oracle.toplink.addin.ui.view.explorer.MWExplorer.setContext(MWExplorer.java:458)
     at oracle.ideimpl.explorer.ExplorerManagerImpl.getExplorerForHost(ExplorerManagerImpl.java:1048)
     at oracle.ideimpl.explorer.ExplorerWindowImpl.viewSelectionChanged(ExplorerWindowImpl.java:544)
     at oracle.ide.addin.AbstractPinnable.viewSelectionChanged(AbstractPinnable.java:232)
     at oracle.ideimpl.explorer.ExplorerWindowImpl.viewSelectionChanged(ExplorerWindowImpl.java:376)
... etc.

If you wish to split your project up into two projects and have some relationships between some of those objects in the projects, you could map all of the objects for each project, but do not map the relationships. For those classes with relationships to other classes in other project you can define an amendment method. An amendment method is a callback into Java code that will be called when the descriptor is loaded. In this method you can then create the mapping to the class in the other project through the descriptor and mapping code API. (see oracle.toplink.mappings, oracle.toplink.publicinterface.Descriptor)
You can also make use of descriptor deactivation to define relationships between projects. For this you would import the related classes into the project and deactivate them. This will allow you to define relationships to them, but will not export their mapping information when deploying.
In general it is probably easier to keep everything in one project and use your content/code management system and merge tools to manage the project.

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