Participating members in the Step-Up shall not be permitted to participate in the Excess Benefit Plan as set forth in 590:10-21-1 et seq. adopted pursuant to 74 O.S. § 915.1 and which was approved by the Internal Revenue Service in a private letter ruling dated June 24, 2010, to the extent any excess benefit, as defined in 590:10-21-2, is attributable to the Step-Up election.
Okla. Admin. Code § 590:10-17-10