17 CFR § 12.307 - Amended and supplemental pleadings.
(a) Amendments to pleadings. At any time before the parties have concluded their submissions of proof, the Administrative Law Judge may allow amendments of the pleadings either upon written consent of the parties or for good cause shown. Any party may file a response to a motion to amend the pleadings within ten (10) days after the date of service upon him of the motion.
(b) Supplemental pleadings. At any time before the parties have concluded their submissions of proof, and upon such terms as are just, an Administrative Law Judge may, upon motion by a party, permit a party to serve a supplemental pleading setting forth transactions, occurrences or events which have happened since the date of the pleadings sought to be supplemented and which are relevant to the issues in the proceeding. Any party may file a response to a motion to supplement the pleadings with ten (10) days after the date of service upon him of the motion.
(c) Pleadings to conform to the evidence. When issues not raised by the pleadings but reasonably within the scope of a formal decisional proceeding are tried with the express or implied consent of the parties, they shall be treated in all respects as if they had been raised in the pleadings.