Okla. Stat. tit. 54, § 54-500-1003A
Proper plaintiff
PROPER PLAINTIFF.
A derivative action may be maintained only by a person that is a
partner at the time the action is commenced and:
(1) that was a partner when the conduct giving rise to the
action occurred; or
(2) whose status as a partner devolved upon the person by
operation of law or pursuant to the terms of the partnership
agreement from a person that was a partner at the time of the
conduct.