Yes, I agree... but I'm playing devils advocate... how is the boundary itself located to within 1mm? I have heard on this site that boundarys can be hard to locate exactly, so if it's only one inch it may be hard to be sure.
I agree that if the boundary is marked by a wall for example, and the wall is agreed to be centered on the boundary, and if the building is clearly 'moved over' in relation to the boundary marker (the wall), then it might be easy to prove.. however if it is only maps or the like, then I think there could be problems... is it not the case that some boundarys are not located, on the ground, to closer than about a few feet or so...