Okla. Stat. tit. 18, § 18-1128: Defective Organization of Corporation as Defense

DEFECTIVE ORGANIZATION OF CORPORATION AS DEFENSE

A. No corporation of this state and no person sued by any such

organization shall be permitted to assert the want of legal

organization as a defense to any claim.

B. This section shall not be construed to prevent judicial

inquiry into the regularity or validity of the organization of a

corporation, or its lawful possession of any corporate power it may

assert in any other suit or proceeding where its corporate existence

or the power to exercise the corporate rights it asserts is

challenged, and evidence tending to sustain the challenge shall be

admissible in any such suit or proceeding.