Artikel 41

When a bill of exchange is drawn payable in a currency which is not that of the place of payment, the sum payable may be paid in the currency of the country, according to its value on the date of maturity. If the debtor is in default, the holder may at his option demand that the amount of the bill be paid in the currency of the country according to the rate on the day of maturity or the day of payment.
The usages of the place of payment determine the value of foreign currency. Nevertheless, the drawer may stipulate that the sum payable shall be calculated according to a rate expressed in the bill.
The foregoing rules shall not apply to the case in which the drawer has stipulated that payment must be made in a certain specified currency (stipulation for effective payment in foreign currency).
If the amount of the bill of exchange is specified in a currency having the same denomination, but a different value in the country of issue and the country of payment, reference is deemed to be made to the currency of the place of payment.