Title XXXV CIVIL PROCEDURE AND LIMITATIONS Chapter 509 Effective - 28 Aug 1943 509.450. Counterclaim set up by amendment, when. — When a pleader fails to set up a counterclaim through oversight, inadvertence, or excusable neglect, or when justice requires he may by leave of court set up the counterclaim by amendment. -------- (L. 1943 p. 353 § 76)
Missouri Legal Code