I never mess with the original return.  I copy the return to a new number or use xxxorig (for original copy), or xxx-X (for amended return).  That way I keep the original file intact.  IF there is an REP issue due to changing numbers, they are supposed to not charge for REP again based on SS#.  What I do is use the amended return with the original #.  If I need to see the original after I changed the number. you can backup the return to another directory (20tax\orig, or 20tax\amended, for example) and change the client # back to the original number.  There are so many ways to accomplish this.