The ordinary income comes from passive losses reported in line 1 of your schedule K-1 for a partnership (form 1065). I'm not sure why there is a 2(a) entry , but the two of them get added together on form 8582, page 2, worksheet 3. So, it would seem safe to enter the losses in the first box (Ordinary Income.)
I think the other boxes are pretty obvious, they refer to carryovers related to the items listed.
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