Does parent-child attribute relationship work in AssetWise Web?

I have two attributes, let's say system and subsystem. After I selected the system I would like to have only the subsystems of the selected system displayed in the subsystem list. In eB Director for any given attribute you can define a Parent attribute but I am not able to make it work. Has anybody done this before?

Our web server is using framework version 19.4.8.42.

Thanks!