49 CFR §29.920

1. (a)A decision of the Self-Governance Official is final and conclusive, and not subject to review, unless the Tribe timely commences an appeal or suit pursuant to the Contract Disputes Act.
2. (b)Once the Self-Governance Official issues a decision, the decision may not be changed except by agreement of the Department and the Tribe or under the following limited circumstances:
   1. (1)Evidence is discovered that could not have been discovered through due diligence before the Self-Governance Official issued the decision;
   2. (2)The Self-Governance Official learns that there has been fraud, misrepresentation, or other misconduct by a party;
   3. (3)The decision is beyond the scope of the Self-Governance Official's authority;
   4. (4)The claim has been satisfied, released, or discharged; or
   5. (5)Any other reason justifying relief from the decision.
3. (c)If the Self-Governance Official withdraws a decision and issues a new decision, the Tribe may appeal the new decision in accordance with § 29.921. If the Self-Governance Official does not issue a new decision, the Tribe may proceed under § 29.919(c).
4. (d)If a Tribe files an appeal or suit, the Self-Governance Official may modify or withdraw the final decision before a decision is issued in the pending appeal.