Mo. Rev. Stat. § 87.370

Any person who shall knowingly make any false statement, or shall falsify or permit to be falsified any record or records of this retirement system in any attempt to defraud such system as a result of such act, is guilty of a misdemeanor. Should any change or error in records result in any member or beneficiary receiving from the retirement system more or less than he would have been entitled to receive had the records been correct, the board of trustees shall correct the error and, as far as practicable, shall adjust the payments in such a manner that the actuarial equivalent of the benefit to which such member or beneficiary was correctly entitled shall be paid.