Hi Shaila
Not sure whether this helps, but with MDG-M 7.0, SAP has shipped an material data model extension to support links to DMS documents. It's also possible to create these documents on the fly, which will then be directly stored in DMS (no staging area for the document itself).
So if your request concerns assignment of documents to materials (not CRs), MDG 7.0 might be an option.
Regards, Ingo