Does the "Allow monitoring of flows from unmanaged interfaces" option help?
just to clarify Andy's post. "Allow monitoring of flows from unmanaged interfaces" allow you to save data to DB when one of the interfaces in conversation is unmanaged by Orion (not in database), but the second one still should be managed and monitored by NTA.
If both interfaces are unmanaged, unfortunately, right now it won't be possible to store this data to DB.
The good news are that we've heard this request from several other customers, so please help us in prioritizing this by adding your request to NTA Feature requests thread: http://thwack.com/forums/73.aspx
What I was thinking is that if the ASA is addable using the inside interface that would suffice for the flows on the outside interface as well.