Adding my experience to the masses.
Our return has:
1) Traditional nondeductible IRA to Roth conversions (backdoor Roth)
2) Inherited IRA RMD distribution
3) Traditional IRA moved into a 401k
When I got this error, I thought it was due to the Inherited IRA distribution (which gets taxed as income). As far as I can tell, that is entered correctly, the Traditional IRA ->401k was not taxed and the Backdoor Roths are not taxed, all as it should be.
What a mess - the comment above that other tax return software is not throwing this error leads me to believe that error we are all experiencing is a Turbotax internal 'feature'....
