How to treat foreign exchange fluctuations at closing balance sheet?

We receord the sales and purchase process at the spot rate in the date we sale ot purchase and then at the end of the year we take the exchange rate and adjust the AP or AR to reflect the current exchange rate and record the difference as loss/gain forign curreny

Please Note that if the accouns is prepared in multi currency, you must use Exchange fluctuation loss or profit in the base currency. Otherewise the Balance Sheet will never balance....