The 1099-B you received should be coded B or E. That is, its a trade where the broker reports the revenue to the IRS, but not the cost. They do that because they recognize that they don't have the right cost: they don't see the K-1. That's why you can simply change the basis and not worry about the $0 under adjustments.
If they had actually reported the basis to the IRS, and there was a specific reason you wanted to adjust it, then their are various codes you can use to show the reason and the amount.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!
