Bank Statement Auto reconciliation doesn't account the exchange rate different in the FX Gain/Loss

we did one payment in USD with X amount but the ledger current in CAD. when we recieve the bank statement and we load the statement and did the auto recon the statement lines are reconciled but the accounting for showing the different amount between oracle and bank statement int he is rounding account instead of FX Gain/Loss. I checked the set up at the bank account level and both FX gain and loss accounts are set up.