Ticket has been opened but in todays market action IB autoliquidated portions of an Iron fly (defined risk at max loss of 60 per contract) when in the account there was more than enough cash to cover max loss.
If someone from IB could explain to us the rationale behind those kind of actions. For reference that is the only position in the account at this time.
I think this happens bc they treat each contract as if what happens when it is exercised into the underlying position, and then settled by closing the trade by exercising the other leg.
E.g:
Say you have $1000 in the account.
XYZ stock trades at $100. $99 strike puts quote for $3. $98 strike puts quote for $2.5.
You do one debit put spread by selling $99 strike and buying the $98 strike to collect $0.5 per contract, or $50 total. Your maximum loss is also $50 (99 strike minus 98 strike for 100 shares is $100 loss plus $50 premium collected).
If XYZ trades at $80 by expiration, rendering that put spread a loss, the broker won't let you hold to expiration. Even though you have $1000 in your account, and your maximum loss to you is $50. Because to buy the stock at $99 strike put that you sold, you will require almost $5000 in your account on Reg-T margin. So you will never be allowed to allow the short option leg to be exercised to begin with during expiration. Even though you will immediately be able to sell back at a loss at $98 strike, for a total loss of $100, but for which you have collected $50 in premium, netting total theoretical loss of $50 to your account, or leaving $950 from $1000.
The thing is they will allow you to open the contract as a spread position, and allow you to close it out as a spread position, but not allow to exercise because it uses more margin than available to you. Closing spread manually is problematic for illiquid options where there is no way to close out a contract without substantial losses (more than the spread position loss).
To close out contracts manually, you will need to close the short legs first (the ones that takes all the margin) before closing the long leg of the spread, for example.
Basically they don't want to lend more to you to fulfill options assignment obligations even for a split second than regulations allow, even though losses are known and capped.