It depends on what the impact is or what the change is. If they change the fundamental....
Let's take a textile as a good example. If they change the requirement for that textile to say all of a sudden, “We want so many hours of UV resistance and we want it to be flexible at -50°C,” or something like that, it changes the type of material you use. It's going to change the way you build it, and then it could have an impact on your solution or what you're offering.
I don't think I've ever seen a situation when they've drastically changed it to the point that we said, “Oh, no. We can't even build this anymore.” I've not experienced that myself.