Transaction currency for bank accounts could be one currency or multiple currencies; it is suggested you assign a single currency for every bank account. You have to navigate to Cash and bank management | Bank accounts | Bank accounts then move to the General fast tab, as shown in the following screenshot:
If, over the course of transaction processing, an accountant tries to post an entry in a bank account that does not permit multiple currencies, a message bar will open showing this message: Currency EUR not allowed for account BNK, as shown in the following screenshot:
