look, if people understand the theory that i posted on the 3rd page of this thread about the bop, then examiners will be very impressed if you can somehow incorporate it into your essays/short answers. it is the correct explanation as to why the bop balances.
if you want to write down in your exams that it is the net errors and ommissions component that balances the bop, or that the floating exchange rate has absolutely nothing to do with it, then go ahead, but i can assure you that you will lose marks.