The Kansas Workers Compensation law provides that compensation due may be settled by agreement and that the employer is entitled to a receipt and release of liability upon final payment of compensation due, and that such final receipt and release of liability shall be filed by the employer in the office of the Director of Workers Compensation within sixty (60) days after the date of the execution of the same, and that such agreement, final receipt and release of liability is made subject to the approval of the Director that the correct amount of compensation has been paid as required by law, and will automatically become approved by law unless disapproved by the Director within twenty (20) days of the date it is received by that office.