001990: The subnetwork system diagram <value> is managed by the system, it cannot be updated


The diagram you are trying to update is a subnetwork system diagram. Subnetwork system diagrams are diagrams that are fully managed; that is, they are created, updated, and deleted by the Update Subnetwork tool.


You can generate such a diagram from the result of the trace returned for the same subnetwork. Then, you will have full rights to this diagram.