Country $ does not store an index currency

What causes this issue?

In internal program processing, the index currency should be determined
for country &V1&. However, an index currency is not defined in the
Customizing settings for country &V1&.
This error occurred in the currency determination for ledger &V2& and
company code / global company &V3&.

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?

Maintain the index currency for country &V1&.
<DS:TRAN.OY01>Maintain index currency</>

Error message extract from SAP system. Copyright SAP SE.