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If a Data Miner client disconnects from the network (for example, if a cable is disconnected or a laptop goes into deep sleep), locks on the workflow are not released. The disconnected session is still running in the database; the session still holds any locks that were applied. The workflow editor has a lock on a workflow that is being edited. Therefore, you get a document in use message when the you try to reopen the document.
To release the locks, the database session holding the locks must be killed.