Currently one can assign to a CAD model, then separately address material in various ways on WTParts, with or without Windchill Product Analytics for example. These are separate unrelated actions and the result can disagree. They are complicated by assigning processes (e.g. anodize, plate, paint, chem. Film, etc.) in drawing notes.
It will be great once PTC provides a method to assign a material once that extends to all representations of the part.