HI,
If I'm not wrong, at this time, Vault is able to map and import existing iProperties coming from "User Defined Property" property set only.
If for some reason or particular customization you need to create your own PropertySet with custom iProperties, you will not be able to import them into Vault UDPs.
I think it would be very useful to extend this feature and allow administrators to map iProperties from any Property Set.
Just for an example, with this feature available, you'll be able to import into vault the "IsCustomPart" iProperty that's simplify rules to understand if a ContentCenter part is a "real" CC part or not.
Thank you in Advance