BUG 10.1.3 EA -- BME-99003 in Business Components Diagram with imported EOs

Question

Following a hands-on exercise in the Oracle JDeveloper 10g Handbook (pages 343 - 345):
-- Create new application workspace, say HRApp, using default Web Application Template.
-- Edit Model project properties to create new library with classpath that points to business domain objects in a project folder from a different workspace.
-- Import the Business Components from the other project's folder, say "businessdomain.xml".
-- Create a BC Diagram in the Model project of the HRApp application.
-- Create a new View Object in the BC Diagram by dragging from Component Palette, rename to "JobsView".
-- Drag entity object representation from new library, say "Jobs.xml" onto View Object.
-- See error message below.
Johnny Lee
Message
BME-99003: An error occurred, so processing could not continue.
Cause
The application has tried to de-reference an invalid pointer. This exception should have been dealt with programmatically. The current activity may fail and the system may have been left in an unstable state. The following is a stack trace.
java.lang.NullPointerException
     at oracle.jbo.dt.modeler.diagram.dropHandler.BC4JXMLDropHandler.processObjects(BC4JXMLDropHandler.java:82)
     at oracle.bm.addinUtil.IDEAppContext$4.performAction(Unknown Source)
     at oracle.bm.diagrammer.LockMonitor.performLockedAction(Unknown Source)
     at oracle.bm.diagrammer.BaseDiagram.performDiagramLockedAction(Unknown Source)
     at oracle.bm.addinUtil.IDEAppContext.dropNavigatorNodeLater(Unknown Source)
     at oracle.bm.addinUtil.IDEAppContext$5.run(Unknown Source)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Action
If further errors occur, you should restart the application.
Also, report the problem on the JDeveloper forum on otn.oracle.com, or contact Oracle support, giving the information from this message.
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Answer 1

We have not been able to reproduce the exact same error, there would be a problem if we were trying to write to the library file, as those objects are read only, of course. Can you tell me, the entity object that you are referencing, has it ever appeared on a diagram? An easy way to tell, if you don't know is by looking at its XML file and see if it has an ID=some long string entry.