kodo.util.UserException: The given instance of type "OurClass" and id "A" is not managed by this PersistenceManager.[OurClass$Identity-A]

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The given instance of type "OurClass" and id "A" is not managed by this PersistenceManager.[OurClass$Identity-A]

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kodo.util.UserException: The given instance of type "OurClass" and id "A"
is not managed by this PersistenceManager.[OurClass$Identity-A]	at kodo.runtime.PersistenceManagerImpl.assertManaged(PersistenceManagerImpl.java:4070)	at kodo.runtime.DetachManager.assertManaged(DetachManager.java:311)	at kodo.runtime.DetachManager.detach(DetachManager.java:275)	at kodo.runtime.DetachManager.detach(DetachManager.java:200)	at kodo.runtime.PersistenceManagerImpl.detach(PersistenceManagerImpl.java:3912)