Comment 2 for bug 1506534

I'm interested in getting some discussion going on this. (There's no time to worry about it for the upgrade I'm doing in 3 days which is the only time I remember it, so I'm just dropping the constraint temporarily) Does a trigger need to do anything more than raise an exception to properly emulate our use of a check here? (i.e. is there an attendant code change required to make this transition complete?) I don't mind throwing some code/testing at it once the end of year pressure is off, but I want to make sure I fully understand what needs doing rather than going off blindly in this direction or that.