Understood - for a previous period that is closed a change like that would make a bit of a mess.  

I've never had to adjust an entry that was that far back in time - not sure how to do that to be honest.  I suppose if the customer has a current year entry that you could adjust in order to zero out the difference it could work to bring the CAD value to zero but I'm not sure if that is correct way to deal with something like that  -?-