They are probably working with a BEW parent or carrier, but none of the offspring are BEW. They are just marked/carriers. BEW is a difficult gene and you have to go about it carefully. I've seen people try to pass off vienna marked as broken blue (Vienna marked opal) before and it really peeved me because the girl waited so long for her "show quality" Holland and when she came to show me her rabbit because the tattoo needed retouching, I told her there was no need as soon as she pulled it out of the carrier. It would be disqualified the second she put it on the table. Not only was it oversized, but it had a nice white spot on its head and a half blue eye.
I felt so bad for her. Especially when it grew to be the size of a Mini Lop.
The vienna marked is the one with the blue eyes and white stripe on its face.
With a BEW program there are:
BEW X BEW = 100% BEW (or REW masking BEW - This is still genetically a BEW)
BEW X "Normal" = 100% Vienna carriers, 0% BEW
Vienna Carrier X Vienna Carrier = 25% BEW, 50% Vienna carriers, 25% "Normal"
Vienna Carrier X BEW = 50% BEW, 50% Vienna carriers
Vienna Carriers X "Normal" = 25% Vienna Carriers, 75% "Normal", 0% BEW
Hope this helps!