Thank you for trying to duplicate the problem. I’ll try the demertz solution. This sounds like another situation in TurboTax where there is a conflict or inconsistency between the step-by-step and the direct forms entry data. I’ve reported at least 3-4 other bugs like that this year.
This year’s edition of TurboTax is full of bugs like this and it’s getting very frustrating! I reported another bug like this a couple of weeks ago that is preventing me from filing my S-Corp return because it’s still not fixed.
In forms mode, TurboTax has a QuickZoom button for code V that will take you to section D1 where you must enter the necessary details. TurboTax properly flags the error on code V if nothing is present in section D1 of TurboTax's Schedule K-1 (Form 1120-S) form. The error description identifies this as being the problem.