I posted about this earlier. But the problem is not entirely on ProSeries.  I do tons of TN F&E returns, along with sales taxes and other Tennessee returns.  The basic filing portal for the Tennessee Dept of Revenue is called TNTAP. 

The state's TNTAP program auto-populates the name of the entity filling the return on line 1 under NAME, no matter the classification of the entity. Partnership, Corp, S Corp.  All !

I have been in a piss fight with the TDOR for 2 days about this, and they just keep trying to explain to me what a Disregarded Entity is.  Not looking at their program at all. Just had another round with them. I'll keep you updated.