The OP is talking about the toonID in the pass/material options of ppro 2010. It's used for getting an object ID pass for use in compositing.

Anyway, the pass does show up in photoshop and nuke, so it should be working in AE too. It is literally named 'ID' though so maybe AE expects it to be called something else ? Maybe try renaming it in photoshop and resave and then try in AE again ?