Quote from ids:
The notion of a per position margin for futures is very qustionable. CBOT and ICE futures margins are SPAN-based. It is portfolio margin by definition. You can take a look at http://www.interactivebrokers.com/en/p.php?f=margin&ib_entity=llc. Please click on Futures tab.
I guess when I turn KC into a covered call it goes from the exchange margin to SPAN, which apparently IB can't calculate and put in a margin report, at least not for NYBOT products? Weird. I'll do a trouble ticket.
BTW, what is the difference between the KT on NYMEX and KC on NYBOT. They are both listed with IB as offering C coffee but have different margin requirements. Why different exchanges for the same product?