Are we talking about this edit That looks like vandalism to me I have no idea who Mr Pena is but the IP modified someone else s comments and added something that looks like irrelevant nonsense To answer your question I doubt there s a written rule anywhere about removing obviously incorrect warnings but it falls into the category of things that are obviously a good idea If someone is a good faith user we don t want to drive them away by falsely accusing them of vandalism But in this case I would not suggest removing the warning you should only remove the warning or replace it with a personal message if the edit was obviously not vandalism