How do you claim for an open position on the form? Does the total claim include the open position? Do you assume the open position is paid in BTC or USD?

ie.
 - Do 5a & 5b (the Total Cash & BTC Owed) include the open position, or are they just the collateral?
 - If 5d (Total Claim) includes the open position, the cost of my open position makes my USD balance negative (I funded the account in BTC). Is that right? Has anyone else had this issue? (eg. if I funded 100 BTC and bought +150 BTC @ 5 USD/BTC = Total claim of +250 BTC and -750 USD)

Thanks!