S.C. Code Ann. § 33-42-1820: Proper plaintiff.

In a derivative action, the plaintiff must be a partner at the time of bringing the action and (1) must have been a partner at the time of the transaction of which he complains or (2) his status as a partner must have devolved upon him by operation of law or pursuant to the terms of the partnership agreement from a person who was a partner at the time of the transaction.