Are you speaking about the Echeck on the server or a downloaded at home? In the first case from the Rules:

"When your orders reach the game server, they are processed by a simple form of our syntax checker, ECheck. The results of this check will be sent to you, and you should read them carefully. While an English version of ECheck exists, it is not perfect, and inconsistencies between it and the server may occur. Orders which ECheck considers legitimate may be ignore by the server, and vice versa. ... Remember, the English ECheck is not perfect, and may not match what the server will accept."

Also importent is the "siple form" in the first line. Echeck on the server doesn't check for Silver at all, it ONLY checks for syntax!

don't let the door hit you on the way out.