Well, I would have sworn Trent was right on this one. But I just attempted to do this via scripts and it reported that only one identity column is allowed per table. I'd use one of Edhy's suggestions.

Er...I mean one of Trent's other suggestions...can't see straight this morning apparently..

Yeah, I noticed the same thing... *scratching head*   I don't have a lot of time to dedicate to this at the moment, but I know that it is possible, so I will have to add this to the "to-look-at" list.