Thats why i always wore a box when playing cricket...."...if someone modifies your design and the modification causes a problem then you would not be liable. Though there could still be a legal battle as you try to prove if the fault was due to the modification or due to the part of the design your company did."
exactly, you're totally right, we wouldn't be held liable presuming we can prove they modified it, that's exactly why we have so many control measures in place, more for accountability, that anything else, as you say to avoid the legal battles. In real terms we're not that really affected, because of the size of the projects we do, we're more design of systems for complete projects than individual components, so our project document controllers monitor everything any but nonetheless we have the same methodology to apply, "Always cover your assets".....