Said refund shall only be issued as the result of a determination by the Commissioners of the Land Office that said erroneous payment of such gross production tax has been made to the Tax Commission during the period after January 1, 1978. Such determination by the Commissioners of the Land Office may create a presumption that the evidence upon which the Commissioners of the Land Office relied in reaching the determination of erroneous payment is correct. The Tax Commission shall not, however, be bound by the presumption of correctness, but may if it deems the circumstances to warrant, present evidence in rebuttal thereof.
Okla. Stat. tit. 68, § 1008