The psychologist shall not undertake or continue a professional relationship with a client when the objectivity or competency of the psychologist is impaired because of the psychologist's present or previous familial, social, sexual, emotional, financial, supervisory, political, administrative, or legal relationship with the client or a person associated with or related to the client. When such relationship impairs objectivity, the psychologist shall terminate the professional relationship with adequate notice and in an appropriate manner; and shall assist the client in obtaining services from another professional.