in the 'edit user' page for Project online 'Resource' one can see when the record was last modified date and time but where can one find who modified it ?
Unless I am sadly mistaken, I do not believe that Project Online maintains an audit trail of WHO changed an enterprise value, such as information about an enterprise resource. If I am wrong, I would gladly ask one of my colleagues in this forum to correct me. Sorry for the bad news, but hope this helps.