How do you prevent FAH from creating Exchange Gain/Loss line for STAT currency?

We are implementing FAH in a US ledger with a ledger currency of USD.  We will have transactions in both USD and CAD and will also need to create STAT entries.  We have configured the Accounting Event Class to calculate Accouted Amounts and calculate Gain or Loss Amounts.  Our jounal lines definitions are setup with journal lines to create both the "dollar" lines and the the STAT lines.  FAH is correctly creating both the "dollar" lines and STAT lines when the "dollars" amounts are in the ledger currency (USD), see example below.  However, when the "dollar" amount is not in