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WTPartHelper.service.getDescribedByDocuments(wtpart);
This API return a older iteration of EPM associated with it.
Example :
part123 B.7 has associated EPMDocument epm123 B.7
but it returns epm123 B.5
Why so?
I might be a little bit late but I just figured out that the WTPartHelper.service.getDescribedByDocuments API retrieves the EPMDocument version located in user's workspace.