Smile? It's cross-sectional. The credit matters but the margin isn't impacted other than your MTM. They are calculating vanna volga under RegT. Right tail risk on a short put?
I can do all of that, I think it was just a TWS hiccup, that shit is buggy at best. The only thing that I can think of is that I have three accounts and two of them have been setup as children of the master account. Permissions to trade are setup individually but live data feed is coming from the master so all can read live data with one subscription. I had weird behaviours in the past with this setup, they keep sending updates for the online version of TWS, so it can be that it was just a bug and they fixed it. I can trade all levels in all three accounts. They are all margin accounts.
Critical thinking. Five seconds of websearch would have given you your answer but you need to be spoon-fed.
You might want to realize that the error message does not appear anymore and I didn't change any permissions on my accounts, as I said.. It is obviously a TWS bug. But I know that you want to troll people. So I am feeding you now with another reply. Come back to me troll.