Okla. Stat. tit. 12, § 12-1144
Action by tenant against cotenant
In an action, by a tenant in common of real property, against a
cotenant, the plaintiff must, in addition to what is required in the
second preceding section, state, in his petition, that the defendant
either denied the plaintiff's right, or did some act amounting to
such denial.
R.L. 1910, § 4930.