If, during the adjustment period, a lessee or its designee determines that an adjustment or refund request is necessary to correct an underpayment or overpayment of an obligation, the lessee or its designee shall make such adjustment or request a refund within a reasonable period of time and only during the adjustment period. The filing of a royalty report which reflects the underpayment or overpayment of an obligation shall constitute prior written notice to the Secretary or the applicable delegated State of an adjustment.

An adjustment or a request for a refund for an obligation may be made after the adjustment period only upon written notice to and approval by the Secretary or the applicable delegated State, as appropriate, during an audit of the period which includes the production month for which the adjustment is being made. If an overpayment is identified during an audit, then the Secretary or the applicable delegated State, as appropriate, shall allow a credit or refund in the amount of the overpayment.

For purposes of this section, the adjustment period for any obligation shall be the six-year period following the date on which an obligation became due. The adjustment period shall be suspended, tolled, extended, enlarged, or terminated by the same actions as the limitation period in section 1724 of this title.