621.193.  Decision of commission to be upheld, when. — In cases reviewable under the provisions of section 621.189, the decision of the administrative hearing commission shall be upheld when authorized by law and supported by competent and substantial evidence upon the whole record, if a mandatory procedural safeguard is not violated and if the approval or disapproval of the exercise of authority in question by the administrative hearing commission does not create a result or results clearly contrary to that which the court concludes were the reasonable expectations of the general assembly at the time such authority was delegated to the agency.