Make sure that ledger &1 and ledger group have the same name

What causes this issue?

No ledger group exists for ledger &V1&.

System Response

This leads to an error.

How to fix this error?

A ledger group with the same name as the ledger is created when a ledger
is created. If this is not the case, follow the Customizing link to
create a ledger group with the same name as the ledger. The ledger will
automatically be assigned to the ledger group when you save the ledger
group.
Note that this ledger group may only contain this one ledger and that
you can't make any changes to the ledger assignment. Please also note
that changes to the ledger group will not be updated in the check
results until you restart the check or transaction.

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.