Description
The network elements you selected as input for the diagram generation are not acceptable for this diagram template. There are diagram rules configured for this template to systematically remove unacceptable network elements.
Solution
Review the template description under the Diagram Templates section on the Network Properties tab of the network layer properties dialog box. The network owner may have provided details in this table to explain how this diagram template works and what input is acceptable. Otherwise, check with the network owner who designed the diagram template.