A TIA Portal global library generated from a SIMATIC AX library programmed using OOP has all the blocks except the wrapper FB as part of a folder called SupportingArtefacts. FBs and FCs corresponding to classes and their methods can't be used directly in the TIA Portal and hence are moved under this folder.
Note
System and Motion blocks that are part of the TIA Portal global library are also moved under this folder.
If a class from a referenced library is used in IN_OUT section of a function block(FB), then the calling function block(FB) will be under SupportingArtefacts folder. This is because the calling function block(FB) can't be instantiated independently.