Jones do you have a link to some documenting that this was a supported feature in 4.3? Unless I simply don't remember, mapping interfaces is something we have never supported at all, even in HBM (its explicitly not supported by JPA).

It is still a reasonable request, but this helps categorize it. If there is documentation as of 4.3 that shows this is supported then this is a regression (bug). However, if there is no such documentation then this is simply a RFE which has different ramifications.