It's absolutely not that. The Mt. Gox system does not allow orders like that.

yah this comment is not realistic - Mt Gox wouldn't allow itself to be hacked if their "system" was strong enough to disallow "orders like that".

It's not what Mt Gox allows that matters - it's been hacked and compromised specifically to allow people to do things that are not allowed

No, I meant what I said. I reviewed the source code before making my post.