What is the ruling on recording a debt in two currencies, with the lender having the choice of the payment method upon maturity, in order to avoid loss?

The repayment of a debt must be in the same currency in which it was incurred. This is because what is established as a liability upon the borrower is what he actually received. If he received it in one currency, it is not permissible to record it in another currency, or in two different currencies. The decisive factor in repaying debts established in a specific currency is in kind, not in value, because debts are repaid with their equivalents. Loss can be avoided by initially denominating the debt in a currency not expected to depreciate.