Mo. Rev. Stat. § 454.1539
Credit for payments.
454.1539. Credit for payments. — A tribunal of this state shall credit amounts collected for a particular period pursuant to any child support order against the amounts owed for the same period under any other child support order for support of the same child issued by a tribunal of this state, another state, or a foreign country.
(L. 2011 H.B. 260) Effective 6-15-16, see § 454.1728