In the docs, chapter " 126.96.36.199 Material Layer Set Usage" it reads:
The concept of Material Layer Set Usage is only applicable to certain product subtypes, refered to as “Standard case” elements. It supports a certain range of parametric definitions for those element configurations.
Can anyone confirm that this sentence is incorrect, as the standard case elements are being deprecated? I believe the intention is that it applies to walls that fit the rules of extrusion such that you can derive the layers, which may or may not be standard case in the future.
Even in the current, I see many IfcSlabs (not standard case) with layer set usages.