Your 1099-B should be broken into different codes (A, B, C, D, E, F). You may not have all of these, but PTP transactions should show up as code B or E. Those mean that the revenue was reported to the IRS, but the cost basis was not. If that's the case, you can change the basis to the correct number and there's no reporting issue (in forms mode, I go to the 1099-B worksheet and enter the correct number on line 7b: 'Corrected basis, if applies"). If your broker reported the transaction as code A or D (both revenue AND cost reported) you should see about getting a correction from them.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!