You cannot create an entry for ledger &

What causes this issue?

You want to create an entry for ledger &V1&. You cannot do so because
either:
ledger &V1& belongs to a different application than the one being
currently maintained, or
ledger &V1& is a dependent ledger (for example, an average balance
ledger).

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?

Error message extract from SAP system. Copyright SAP SE.