How to amend a signed chart note - katya

Gotta question - I work in-house for a group practice that oursources the transcription to a service, then I work as an editor for the final review before the paper copy goes for signature.  The paper copies are faxed to the cc list of doctors on that note.  The original is then scanned into an EMR, with the paper copy then shredded.  There is talk of an electronic signature, but we're not there yet.  So my question is this - what would be the best way to deal with a doctor's request to change something on a previous document that has already been signed, scanned, and faxed to the cc list, sometimes a week or more ago.  The change is not an MT error - example is, oops, I meant papilloma, not carcinoma, please change that in the diagnosis.

They are asking that we contact the service to make the change, put the word AMENDED at the top of the note, and then have it signed again, faxed again, etc., and we can delete it from the EMR and rescan it.  This doctor is new to this service (we have two), and is the only who is tending to want this kind of change.  Obviously, this sort of "error" should be caught before signed, but what if it's not?  Instead of AMENDED, would it be better to just dictate a separate note explaining the error of a previous note?  Or is the process they're asking for the best way to go?

Thanks for reading a lengthy question.