When parts are being classified, at WC10.2, selection of Classification nodes is attribute based. And if there are multiple nodes of classificaiton that needs to be selected, then classification binding attribute has to be multi valued attribute. Due to this there is a chance that user might cross select different nodes.
For E.g. if user is classifying a part against a Helical Gear, then only nodes of Helical Gear should be allowed in multi valued atrribute. User should not be allowed to select nodes of Reverse Idler.