In march of 2010, Natalie of Calypso Morphs hatched a clutch of savs from her 2. They haven't bred since then that i know of or before that one time but she does have pics posted all over of it. I only know this because she's both on my myspace and FB pages and I've seen the photos of the mating, eggs, hatching, and babies.

Of course, at the time the adults were not in "proper" enclosures but it did happen. Fluke? Maybe. But it proves its possible.