You are not allowed to valuate a valuated currency type

What causes this issue?

You want to carry out a balance valuation for a currency type that has
already been valuated itself, for example:
Currency type 11: "company code currency, group currency".

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?

You cannot carry out a balance valuation.
Balance valuation is only allowed for non-valuated currency types (such
as 10, 20, 30, and so on).

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.