Allow for Reviewer and Preparer to comment on a single CN more than once and have it retain their edit history. Ex:
Reviewer: "Add w/p XYZ to the B.1 & ref it in the B.1.PRG step(s)."
Preparer: It has already been added to A.1 folder
Reviewer: Great, then please add hyperlink to B.1.PRG step(s).
Preparer: I've hyperlinked the w/ps to two steps.