If you've corrected the cost basis, it may be a different issue causing the problem.
At the top of the input screen, there is a box to note Short or Long term gains and filing status.
Code A. This code indicates a short-term transaction for which the cost or other basis is being reported to the IRS. Use this code to report a transaction that the recipient will report on Schedule D (Form 1040), line 1a, or on Form 8949 with box A checked with totals being carried to Schedule D (Form 1040), line 1b.
Code B. This code indicates a short-term transaction for which the cost or other basis is not being reported to the IRS. Use this code to report a transaction that the recipient will report on Form 8949 with box B checked with totals being carried to Schedule D (Form 1040), line 2.
Box C. Report on a Part I with box C checked all short-term transactions for which you can't check box A or B because you didn't receive a Form 1099-B (or substitute statement).
Code D. This code indicates a long-term transaction for which the cost or other basis is being reported to the IRS. Use this code to report a transaction that the recipient will report on Schedule D (Form 1040), line 8a, or on Form 8949 with box D checked with totals being carried to Schedule D (Form 1040), line 8b.
Code E. This code indicates a long-term transaction for which the cost or other basis is not being reported to the IRS. Use this code to report a transaction that the recipient will report on Form 8949 with box E checked, with totals being carried to Schedule D (Form 1040), line 9.
Box F. Report on a Part II with box F checked all long-term transactions for which you can't check box D or E because you didn't receive a Form 1099-B (or substitute statement).