Hi,
As far as I know there is no such BusObj tool (not at least up to version BO XIr2).
There are some 3rd party tools but you would need to purchase them. ONe of them is for instance Version Manager from ebiexperts:
http://www.ebiexperts.com/version-manager.html
Another option would be to use this utility for documenting BO universes:
and then to build by your own something on top of it that would compare 2 universe structures.
Marek Chladny (BOB member since 2003-11-27)