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@Anonymous On the K-1, you'd enter for sales, 1282 for Ordinary Income, and -1282 for Partnership Basis.  On the next screen, you'll see that this info causes it to calculate zero cap gain/loss.  But, you'll see the $1,282 show up on Form 4797 just like it should.

On your cap gain/loss, I'll combine ST and LT for a moment.

You sold for $6,515

You purchased for $8,373

Your total adjustments were -$1659

So your cost basis is 8373-1659 = $6,714

Your TOTAL profit/loss on the sale is 6515-6714 = -$199

That TOTAL loss of $199 is split into 2 pieces:  Ordinary Income of $1,282 and a Capital Loss of -$1,419 (this number just comes from -199-1282).

So you want your 1099-B to show a total loss of 1,419, which means you need a total basis of $7,934.

Make sense?

The final complication is that this is split between short term and long term.  Your Sales Schedule should have a column in it that tells you the % of the adjustment that is short term vs long term.  You'd have to repeat the process above for each piece, but the total will get to the same place.