701—7.43 (17A) Docket. The clerk of the hearings section for the department shall maintain a docket of all proceedings, and each of the proceedings shall be assigned a number. Every matter coming within the purview of these rules shall be assigned a docket number which shall be the official number for the purposes of identification. Upon receipt of a protest, petition for declaratory order or petition to initiate rule-making proceedings, the proceeding will be docketed and assigned a number, and the parties notified thereof. The number shall be placed by the parties on all papers thereafter filed in the proceeding. After the transfer of a case to the division of administrative hearings for contested case proceedings, that division may assign a docket number to the case and in that event, the docket number shall be placed by the parties on all papers thereafter filed in the proceeding.