Oh I see. Good language to have to clarify what happens if someone changes job classification. But if someone doesn't (change), then...?
It's certainly not a typical condition such as hours worked or employment status. I guess I would say that I wouldn't tell the client "it's fine." I wouldn't tell them they couldn't either. I think I'd explain it as best I could and point out the risks and let them decide. But I think I would recommend against it...