Thanks, this helped me identify the error and fix it. I tried entering "Various" for the Box 2 (Type of Gain), but I guess this keyword only works for dates. I know the date of acquisition even though it was not reported on 1099-B (and therefore empty Box 2).
The error Turbo Tax was giving me was related to leaving Box 2 (either line 9a in 1099-B worksheet, or line 1b(3) in Capital Gain Transaction Worksheet) empty, while having a corrected Type of Gain indicated (for either line 9b in 1099-B worksheet, or line 1b(4) in Capital Gain Transaction Worksheet). Review give error message "Type of Gain Reported must be entered when corrected gain or loss is entered".
It turns out error can be fixed by leaving both of those lines blank in the worksheet. Later when I enter the date of acquisition, TT knows to enter the correct type of gain (L or S) in the "Holding Period" field in the final "Result".
