Can't boot from external Lion drive on Retina Macbook

Hey guys,
I like to create clones of my startup disk when transitioning between machines or systems to be able to boot from these if anything goes wrong, I forgot stuff, sell the old machine etc. etc.. This always worked nicely, I have an external drive with two partitions, one Snow Leopard, one Lion that I can boot from with my old macs running Lion.
Now I just got a new Retina Macbook and 10.8.3 doesn't let me boot from either, the Lion partition just gives me the prohibitory sign.
I'm aware that the Retina Macbooks won't run Snow Leopard but from what I read they should let me boot from systems as "old" as 10.7.4. Is there something I am missing here?
Any help would be greatly appreciated.
Thanks,
V

MacBooks Pro with Retina display came with a special OS X 10.7.4 build when they were launched, so if you are trying to start from a OS X 10.7.4 installed on a different computer, your computer won't start. Also, note that your Mac may be restricted to use OS X Mountain Lion or later by firmware. It's worse in the 13-inch MacBook Pro with Retina display, which can only run Mountain Lion

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