Odoo 15 brings up a new report related to the Currencies ie. Unrealized Currencies gains/losses Report. This report will display all open amounts on your balance sheet that need to be reevaluated. It is grouped by the currency and their respective accounts. So this reporting system will be helpful If your company works with multiple currencies and you can get up to date, real-time data, that informs you of all the Gains/Losses and the respective adjustment you should make.