While working with Enterprise Architect (EA), it has already happened a few times that for unknown reasons objects in EA database referred to classifier GUIDs that are not or no longer existing. If the underlying database is an oracle database, such entries can be found by using the following SQL query.

SELECT [o].*
FROM [t_object] [o]
FULL OUTER JOIN [t_object] [c] ON [o].Classifier_guid = [c].ea_guid
WHERE [o].Abstract = '0'
AND [o].Classifier_guid IS NOT NULL
AND [c].ea_guid IS NULL