Our business requires a few more price levels than the available 36 (0-9 and A-Z).  I tested some special characters and everything seemed to work as normal from a sales order entry perspective.  Specifically, I tested '!' and '@' as price levels.  Is there any reason I shouldn't use special characters as price levels?  I just want to make sure any backend logic won't get jacked up by using special characters.

Thanks much.