If a system deviates from its design, the contractor becomes
liable for any such failure, whether related to the specific deviation
or not.
This seems a recipe for an eternal blame-game where the "engineer of record" aims to produce a plausible-but-impossible specification and manufacturers spend 99% of their time looking for loopholes.If your aim is to explain why your scifi setting has an entire planet covered with a kilometer-thick layer of used triplicate forms, this would be a great place to start. :P