How to politely reply to adviser for his mistake I sent one abstract to my supervisor, which he approved and said it is fine. Later on, when the same abstract was published and circulated on university email, he sent me an email and stating that this Abstract is not good and you should have checked it with me before sending for circulation. I have his email of approval and I know he also does know that I checked this abstract with him before submission but seems he want me to take the blame. How do I cope with this situation, I don't want the relation turning bad or aggressive for both of us.
I suggest a slightly longer response than Nicole's answer that allows for a somewhat graceful exit and has less potential for coming across as reproachful between the lines:


  I am not sure which part you are referring to; you did approve the abstract as such (see attached), but were you maybe referring to another piece of text?