This is a bogus message from TurboTax that many people have complained about. Ignore it. A code-G Form 1099-R with the IRA/SEP/SIMPLE box marked indicates a rollover from an IRA to an employer plan, never anything to do with a Roth IRA. TurboTax should just be asking you to confirm your entries because a rollover from an IRA to an employer plan is less common than other types of rollovers reported with code G.
