DBM cashdesk has been developed with intention to support cashiers working in small shops within dealerships.
To keep the usage of DBM cashdesk as simple as possible, DBM supports only company currency which fits the original intention.
If the business process requires to use currencies than company currency, you can use tc.: FBJC where you have to add first Company Code and Cash Journal and you can enter receiving and paying in foreign currencies with different business transactions.
Hope the information is useful.