The 1099-B provides some context:
This transaction reflects the conversion of a short-term capital loss into a long-term capital loss. This occurs when you have a short-term loss on mutual fund shares which were held 6 months or less, and you received a long-term capital gain distribution on those shares. For information about the rule, please refer to Internal Revenue Code section 852(b)(4) or IRS Pub. 550, Capital Gains and Losses Section. Taxpayers will need to reflect this adjustment when preparing their tax returns.
I am able to go in and edit the sale manually, but TurboTax only lets me enter the Proceeds (box 1d) and the Cost basis (box 1e), and it calculates the Gain or Loss from those. To accurately reflect what's been reported, I need to enter a different Gain/Loss than what is being calculated.
