Iowa Code § 488.1003: Proper plaintiff.

A derivative action may be maintained only by a person that is a partner at the time the action is commenced and where one of the following also applies:

1. The person was a partner when the conduct giving rise to the action occurred.

2. The person’s 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.