Interactive Schedule question

[Craig Bagley]

In AC9, there is a default Interactive Schedule called Basic Window Schedule. In the Fields tab page, the Basic Window Schedule lists 5 parameters. I can trace the source of most of the parameters, but can't trace the source of two text parameters: "Material" and "Custom Parameter 1" (there are non-text Material parameters...no problem finding those). I have looked under the Available Parameters field on the left of the page, and searched through all library parts under Additional Parameters (using the AC9 Library). Am I missing something?