On form 6252 Line 19, ProSeries Help says:

"From prior year if this sale is from a prior year and you utilized the transfer function from prior years; or calculated as a result of the current year sale; otherwise enterable."

I have neither transferred from prior year, nor is it current year of sale, and Line 19 is still not enterable. If I delete Part I entries, it becomes enterable but per new instructions, Part I needs to be filled out for all years. Any solution for this?