[OS X Emacs] RCS problem/question

[Johannes Brauer]

Hi

I have got a file, say x.tex, which is readonly, because it was  
checked into RCS.
I open the file in aquamacs. Trying to modify the buffer causes the  
message: Buffer is read only ...; okay!
I do C-x vv to check out the file from RCS. Then I get the message:
x.tex changed on disk; really edit the buffer? (y, n, r or C-h)
Why? It couldn't be edited because it was read only.
When I answer "n" and then do M-x revert buffer I get the same message  
once more.

Can anyone explain me this behaviour?

Johannes