https://www.fanniemae.com/content/announcement/svc1411.pdf

I'm posting this question for a friend who works for an institution who has a huge portfolio of Fannie Mae loans they service... Does anyone see an issue with reporting suspicious activity to Fannie, based on FinCEN's final rule implementing AML programs for Government Sponsored Entities (GSEs), since we technically, can't report that we've filed a SAR? Fannie is now defined as a Financial Institution so, should we be following 314(b) requirements? Anyone have thoughts?

This may answer part of your question. See page 35 Section E for 314 information.

Federal Register

Thanks! I'll pass it along!