The static templates were not accepting ticker symbols with dots in them. This is now fixed in version 1.3.7 of the Exchange extension.
As a sidenote:
The format for markets is BASE_QUOTE, not QUOTE_BASE as is usual in other exchanges.
The reason for this is historical. When I started the exchange, only Poloniex and Bittrex was around, and I copied the notation as used in Bittrex at the time. So, if you want to create a market where Bitcoin is traded against the dollar, that would be a USDT.ERC20_BTC market. Not the other way around.
It’s important to get the ordering right, because the semantics of “bid (buy)” and “ask (sell)” refer to buying or selling the quote currency against the base currency.