Custom baseline screen does not display node types

Symptom

SUM does not display a node type when filtering source for a custom baseline.

Solution 1
Cause

The source baselines might not contain components for that node type.

Action
Make sure that the baseline includes components for the node type.
Solution 2
Cause

A node type might be clear.

Action
Deselect all node types in Advanced filters to see all components in baseline sources, and then select the components you want to add to the baseline.