Okla. Admin. Code § 330:10-9-3
(a) If any document or documents constituting a part of a mortgage file are defective or incomplete in any material respect, the affected participant shall cure the defect within a period of 60 days from the time the Trustee notifies the responsible participant of the existence of the defect. Each participant covenants and agrees that, if any material defect cannot be cured within such 60 day period, the participant will, not later than 90 days after the Trustee's notice to it respecting such defect, purchase the related mortgage loan from the Agency at a price equal to: