Retirement tax questions

I've read this from several sources, that converting to Roth should not count against MAGI for making a RothIRA contribution.   My problem is that TurboTax says it does count.   No matter how I enter a simulated 1099-R it adds the rollover amount to MAGI and declares my RothIRA to be excess contributions.    If there is some magic combination of codes for Box 7 of the 1099-R to make this work, I can't find it.