(805 ILCS 215/1003) Sec. 1003. 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.