What to do with realized gain/loss

Good Morning,

At the moment our users are billing USD invoices in our CAD org to our customers in our AR Subledger. The customers are paying in CAD which is causing a realized gain/loss amount when the check is booked and applied. I can not for the life of me find what the standard subledger solution is for this remaining balance, whether it be on the invoice or receipt. At the moment the users are creating manual debits or credits and applying them in the subsytem to clear the receivable and moving to gain/loss accounts but this is resulting in these credits