CPS currency key & not defined

What causes this issue?

The currency key for the company pension fund determines the currency
used for a particular period. However, the currency key used (&V1&) has
not been defined.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

In table T5DWF, maintain the currency key with the currency.
Alternatively, use an exisiting currency key.

Error message extract from SAP system. Copyright SAP SE.