Use foreign currencies and automatic exchange rates, and keep financial accounts in different currencies. CashCtrl suggests up-to-date exchange rates. CashCtrl settles exchange rate differences with the click of a button at the end of the year.
If your debtor account and bank account use Swiss francs, but you're paying an invoice in euros, the system automatically creates another book entry for the exchange rate difference.
Update 2022: exchange rate differences can be booked at any time, i.e. also at the end of the month.