Source currency type is empty for currency type &2 in CoCo &1

What causes this issue?

In company code &V1& currency type &V2& is to be calculated from a
currency type. However no entry has been made for source currency type
in company code &V1&.

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?

Enter a currency type in the currency conversion settings for company
code &V1&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.