(1) Right to amend. A party to an administrative hearing may amend a pleading once as a matter of course at any time more than twenty days before the date set for hearing. Otherwise, a party may amend a pleading only by leave of the administrative law judge or by written consent of all adverse parties.

(2) Action on motions to amend. The administrative law judge shall freely give leave to amend when justice so requires. The administrative law judge may designate a time for filing an answer to amended pleadings that may be answered, and may reschedule other dates, including the hearing date, if this is necessary to assure that issues for hearing are fully and properly framed.

(3) Form of amendment. An amendment other than one made on the record during a hearing must be in writing. A written amendment may be in the form of either a revised pleading superseding the entire text of the amended pleading, or a supplemental paper containing only the amendment.