[Geoff Bacon]

I would argue that a "Save as New PDF " warning is required - I suspect most users try things to see what happens and are not aware that they will lose the ability to revert.

Also, I don't envisage that users will be constantly using this feature so they are not likely to be inconvenienced by a warning being shown and, if the use is indeed infrequent then, they have probably forgotten about the implications of saving.

Geoff
PS: I haven't tried the feature!