When claim may be presented as counterclaim by supplemental pleading.

Mo. Rev. Stat. § 509.440
in effect
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509.440. When claim may be presented as counterclaim by supplemental pleading. — A claim which either matured or was acquired by the pleader after serving his pleading may, with the permission of the court, be presented as a counterclaim by supplemental pleading. (L. 1943 p. 353 § 75)
Source: Open US Law by Vaquill AI (CC BY 4.0)URL: https://revisor.mo.gov/main/OneSection.aspx?section=509.440Fetched: 10/17/2026

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