Mo. Rev. Stat. § 509.170
Current with changes from the 2023 Legislative Session
In pleading the performance or occurrence of conditions precedent, it is sufficient to aver generally that all conditions precedent have been performed or have occurred. A denial of performance or occurrence shall be made specifically and with particularity, and when so made, the party pleading the performance or occurrence shall establish on the trial the facts showing such performance or occurrence.
§ 509.170, RSMo