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In that case You can do just two things.

First ask him not to flatern (intresting tone correction will try it) or second - make copy.

If you exchange your works through shared disc or server then (if you have permision to change permissions) you can restrict "modify" file permission (or something like that). Then your guy can read file but will not be able to save over it but thats all depends on file system. So you will have two copies one with his job (flatern) done and one yours (but not with skin corrected). Little bit uncomfortable but thats exclude posibility to damage unrestoreable.