This read-only object identifies which single VLAN is currently locked for editing within the VTP edit buffer, with a value of zero meaning any VLAN may be edited and a non-zero value restricting edits to just that one VLAN, on devices that only support editing one VLAN per apply cycle. An administrator checks this to understand why edits to a different VLAN in the buffer are being rejected on such devices. For example, if vtpVlanEditModifiedVlan shows VLAN 20, the admin knows only VLAN 20's edits will be accepted in this apply cycle, and it resets to zero once that apply or a release completes.