What causes this issue?

&V3& &V1& &V2& is marked for deletion. You can no longer post to &V3&.
Master data changes are also no longer possible. &V3& will
be physically removed in the next reorganization run.

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.