Roth 401(k) rollover to Roth 403(b)

[Guest Brian0925]

Can a participant rollover their Roth 401(k) account to a Roth 403(b) and vice versa. I was under the impression this was not permitted. I thought I read recently, that the PPA contained language permitting rollovers between roth accounts. Any information and supporting regulations are appreciated.

Thank you