If you are using VRC integrated with PTC, use the PTC Topology Manager instead of the VRC Topology View to delete a region from the topology database.
When you delete a region by using the PTC Topology Manager, PTC updates its database to delete the region and notifies VRC that the region is removed.
Note: You cannot delete a region using PTC if the region contains active network elements.
VRC validates the change and deletes the region from the database.
The region is also deleted from the CNS Security database.
The PTC Topology Manager notifies you when the operation is complete.