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OK.  That $3220 is not your revenue.  "Withdrawals" on that line refers to the cost basis you withdrew, not how much you sold it for.

As a simple example,

• if your beginning capital account was $0,
• you bought for $2400:  "Capital contributed"... would show $2400
• every line on the K-1 is 0:  "Current year net income" would show $0
• you sold late in the year for $3100:  "Withdrawals and distributions" would show $2400 -- the value of the capital you originally contributed.

In your case, since you bought for $2400, and received no distributions, I'd assume there's $820 worth of income showing up on the K-1, which is what raises your Capital to $3220.  That $820 is going to show up on your return somewhere (make sure you verify that!), and you'll be taxed on it.  As a result, you increase your basis on your 1099-B by that $820 to avoid any extra taxation.

• In the real world, you spent $2400 and received $3100 for a profit of $700.  You should pay taxes on $700
• In the tax world, you got some phantom stuff on the K-1 worth $820.  So you get to change the basis on your 1099-B to give a Cap Loss of $120.  Again, you pay taxes on a total of $700.

Note that its a little more complicated if the Sales Schedule shows Ordinary Income, but I don't think that applies to USO