NucleusUserException in StampedeTest

Stampede test logs show some of the following exceptions:

13.10.2011 10:52:29 ERROR [org.hippoecm.repository.RandomActionTest$RandomActionRunner.handleThrowable():304] FAILURE in thread thr1 performing action EditDocumentAction on path /content/documents/test/document7/document7 : org.datanucleus.exceptions.NucleusUserException: Transient instances cant be deleted.
Transient instances cant be deleted.
org.datanucleus.exceptions.NucleusUserException: Transient instances cant be deleted.
at org.datanucleus.ObjectManagerImpl.deleteObjectInternal(ObjectManagerImpl.java:1627)
at org.datanucleus.ObjectManagerImpl.deleteObject(ObjectManagerImpl.java:1572)
at org.datanucleus.ExecutionContextImpl.deleteObject(ExecutionContextImpl.java:434)
at org.hippoecm.repository.ocm.ValueMappingStrategy.storeObjectField(ValueMappingStrategy.java:734)
at org.hippoecm.repository.ocm.ValueMappingStrategy.store(ValueMappingStrategy.java:672)
at org.hippoecm.repository.ocm.ValueMappingStrategy.update(ValueMappingStrategy.java:584)
at org.hippoecm.repository.ocm.UpdateFieldManager.storeObjectField(UpdateFieldManager.java:53)
at org.datanucleus.state.AbstractStateManager.providedObjectField(AbstractStateManager.java:1043)
at org.hippoecm.repository.reviewedactions.BasicReviewedActionsWorkflowImpl.jdoProvideField(BasicReviewedActionsWorkflowImpl.java)
at org.hippoecm.repository.reviewedactions.FullReviewedActionsWorkflowImpl.jdoProvideField(FullReviewedActionsWorkflowImpl.java)
at org.hippoecm.repository.reviewedactions.BasicReviewedActionsWorkflowImpl.jdoProvideFields(BasicReviewedActionsWorkflowImpl.java)
at org.datanucleus.jdo.state.JDOStateManagerImpl.provideFields(JDOStateManagerImpl.java:2923)
at org.datanucleus.state.ObjectProviderImpl.provideFields(ObjectProviderImpl.java:65)
at org.hippoecm.repository.ocm.JcrPersistenceHandler.updateObject(JcrPersistenceHandler.java:136)
at org.datanucleus.jdo.state.JDOStateManagerImpl.flush(JDOStateManagerImpl.java:4841)
at org.datanucleus.ObjectManagerImpl.flushInternal(ObjectManagerImpl.java:3179)
at org.datanucleus.ObjectManagerImpl.flush(ObjectManagerImpl.java:3119)
at org.datanucleus.ObjectManagerImpl.preCommit(ObjectManagerImpl.java:3260)
at org.datanucleus.ObjectManagerImpl$2.transactionPreCommit(ObjectManagerImpl.java:324)
at org.datanucleus.TransactionImpl.internalPreCommit(TransactionImpl.java:394)
at org.datanucleus.TransactionImpl.commit(TransactionImpl.java:279)
at org.datanucleus.jdo.JDOTransaction.commit(JDOTransaction.java:90)
at org.hippoecm.repository.impl.DocumentManagerImpl.putObject(DocumentManagerImpl.java:164)
at org.hippoecm.repository.impl.WorkflowManagerImpl$WorkflowInvocationHandler.invoke(WorkflowManagerImpl.java:634)
at $Proxy16.obtainEditableInstance(Unknown Source)
at org.hippoecm.repository.action.EditDocumentAction.doExecute(EditDocumentAction.java:31)
at org.hippoecm.repository.action.Action.execute(Action.java:38)
at org.hippoecm.repository.RandomActionTest$RandomActionRunner.step(RandomActionTest.java:261)
at org.hippoecm.repository.RandomActionTest$RandomActionRunner.run(RandomActionTest.java:194)
at java.lang.Thread.run(Thread.java:662)