A Rick said, ProSeries needs to know the Basis of the Traditional IRA.  I think Rick's method of entering the Traditional IRA contribution works (and is probably the correct way to do it), but I also think there is a "Quickzoom" button on the 1099-R worksheet that you can enter Basis as well.

If there were not any remaining Traditional IRA balances at the end of the year, there should be $0 of tax due to the current year backdoor Roth.