This is 05-107-03: Fimbriated Space X Dresden Dancer. The cross was motivated by flat breeding, not SA.
It's strange how a picture can sometimes show what you can't see in the garden. From across the bed the blooms have yellow cast, but up close the bloom looks clear white. As I edited this picture I noticed yellow veining over the entire bloom... that explains the yellow cast from across the bed. I guess I need to go back to the pedigrees... must be yellow behind FimSpace somewhere. I always assume white is blue with inhibitor...