Return
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Title
The item already exists or was deleted by another user when migrating to a Document Set -
Description
When migrating to a document library that has a document set assocatiated to it you get an error saying "the item already exists or was deleted by another user" -
Cause
This is normally caused by a workflow or action that happens when data is added by the document set. -
Resolution
Remove or disable the workflow or scripts that are running until the migration is complete.
In one case, re-creating the document set corrected the issue.