Quote from Toland:
What about if the broker said that is was
an error and suggest you either to cancel
the trade or requote it? The friend of mine had it several times with IB and lost some money each time.
I've had about 2000 forex executions with IB this year and not once have they come back and modified the price or cancelled an execution. And even if it did happen, it would be due to the third party bank as IB doesn't take the other side of the order.