Mo. Rev. Stat. § 104.1051
1. Any annuity provided pursuant to the year 2000 plan is marital property and a court of competent jurisdiction may divide such annuity between the parties to any action for dissolution of marriage if at the time of the dissolution the member has at least five years of credited service pursuant to sections 104.1003 to 104.1093. A division of benefits order issued pursuant to this section:
3. A system shall have the discretionary authority to reject a division of benefits order for the following reasons:
(L. 1999 S.B. 308 & 314)