You can valuate balances only when using a ledger group

trados = fi

What causes this issue?

You want to valuate balances in the general ledger. However, the system
cannot assign a ledger group to the valuation area. This connection is
necessary for the program to read the balances from the correct
ledger(s).

System Response

Error message.

How to fix this error?

Assign a ledger group to the valuation area.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.