The important thing is to report the sale at least once, but only once. Because you need to enter the K-1 anyway, you can report the disposition via the K-1 (as you apparently have done, by selecting the "I disposed of my interest...." during K-1 entry) instead via the 1099 you received.
Whichever way you go, be sure that you report the sales proceeds (i.e., from the 1099-B) and cost basis correctly. Note that your cost basis is likely not your original investment, but your basis in the partnership after all the transactions; i.e., at the time the partnership was sold or closed.
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