The target currency does not exist in the currency table

What causes this issue?

The currency which the value is to be converted to does not exist in
the currency table.

System Response

The function is terminated. The markdown plan remains unchanged.

How to fix this error?

If you entered an incorrect currency, restart the function using the
correct currency. If necessary, enter the currency and the exchange
rate.

Error message extract from SAP system. Copyright SAP SE.