It is absolutely necessary. EBAE Apendix C section 3 instructs us that the note is required.
There are also a couple of new chsnges that you should be aware of. There is an update to the Computer Code on the BANA website available for download at http://www.brailleauthority.org/update-cbc10/cbc-specialsymbolsupdate2010.pdf
I hope this is helpful for you,