Exchange rate of &1 in &2 for date &3 could not be determined

What causes this issue?

You have entered a currency for which no valid exchange rate could be
determined for the pricing date.

How to fix this error?

Check whether a valid exchange rate for this currency exists for &V3&.
If this is not the case, define an exchange rate in Customizing,
providing you have the authorization to do this.

Error message extract from SAP system. Copyright SAP SE.