1. Only TWS allows you to use the FXCONN method of FX. With WebTrader and mobile you are limited to IDEALPRO. The problem with IDEALPRO is that it adds an annoying FX line to your portfolio to track you FX P/L. That can be removed using some non-trivial process, but it's just easier to use only the TWS.
2. No, your order will just be cancelled with insufficient funds of the appropriate currency
What is this line in your statement annoying? Just ignore it. I don't understand that part, other than many people occasionally ask "What is this line in my statement?" and some people find those questions annoying.
If you don't like TWS and prefer WebTrader, I really don't see the problem here. Just use WebTrader...and ignore the extra line in your statement, that's all.
ahah thanks both! i can finally proceed with my first overseas stock purchase
update: i tried buying 2K USD and i got a message stating "Confirm Mandatory Cap Price". What is this?
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