Making multi currency payments, using a bank account for which the currency is different than functi

Hi There, I Need quick advise on Multi currency payment. We have a scenario where our Functional currency is USD and we had a bank account for which is in GBP currency. And  is different than functional currency (USD), Business wanted to use this GBP bank account for multi currency payments.. I understand that in R12 there are limitations that, we can only make multi currency payments if the bank account currency is same as functional currency, in this case both should be in USD. And if the bank  Account is different than functional currency that bank account will not