RE:RBCI have no clue as to the legality of their write offs but man, if this was a mistake it is a whopper. They should fire the CFO and any chartered accountants involved . Not sure how a major mistake like this can happen . $ 485 mil should not be a " grey area" subject to interpretation of the rules. Yikes. If I didnt know better I'd say this is Socks' way of doing an excessive profit tax in a stealth manner. Wouldnt put it past them.