The biggest trading error in the stock market

Gee...just can't believe that one simple "key" can lose you a tremendous amount of money. A trader(dealer) placed a wrong order for a foreign customer simply because she was not quite familiar with the newly installed computer programs. But she is not the only one to blame. How come their internal control systems didn't give them any warnings or alerts.
8 billions are definitely not a small amount of money. As I see it, they (Fubon securities) deserved it!