TT will not accept negative number for 1099B adjustment codes

I'm using TT Business (Windows) and entering 1099-B data in summary form. There are values in the 1099-B box 1f that reduce the gain as reported on the brokerage statement. After entering the proceeds and cost basis TT gives the option to select "My statement includes adjustment codes as described in Form 8949 instructions", which leads to an entry box titled "Total Adjustments to Gain/(Loss)". This is where I should be able to enter box 1g values, but that box will not accept negative numbers (despite the fact that the Help link says to "enter the adjustment as a positive or negative number"). Without entering a negative number here the reported gain in TT is higher than the 1099-B.

I guess that I could increase the basis to force a correct gain, but that seems crude. Any thoughts here? Is this a bug or am I missing something? Thanks!

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