The IRS only officially released it out of draft status on 1/18. 

Lacerte has historically produced a basis schedule with the same information that the 7203 requires, and I expect that in a few weeks or months we'll have a working 7203 in Lacerte.

It's my understanding that ProSeries has not historically provided an automated way to calculate and apply the basis limitations (to the extent that people were using the at-risk form as a workaround).  This is brand-new functionality for that program, hence the question.