@TheHeurist-- With MLPs, the broker isn't reporting the cost basis to the IRS so adjustments are straightforward and aren't likely to generate questions. In your case you're better off having the broker correct the 1099-B if they reported an incorrect cost basis. Then there's nothing to adjust, or to explain the the IRS.
As to handling this in the interview, just enter 0 for proceeds and cost in the K-1 interview: you report the Cap Gain in the 1099-B section, and the other K-1 stuff in the K-1 sections.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!
