I did a manual weight and balance for one of our foreign carriers tonight. They overloaded the 747-200, exceding the zone structural limit by 500 kgs in one of the aft positions. Now I know that this does not sound like a lot to most people, but to me it's a BIG deal when I am required to trim out this plane and then sign on the dotted line. I get a little burned when the carriers think that if their cargo is half way to the destination it's better than not at all. Even if it has to sit in the warehouse for days till we can upload it to another flight. My Captin got pissed at me when I refused to sign the weight and balance. I did not sign, but I did make the offer to shift the cargo around to put it within the limits. And you know what? He took the flight out anyway. Any thoughts or views on this or am I just ranting??