Okla. Stat. tit. 12, § 1196

If the plaintiff takes issue with the answer of the garnishee, the plaintiff may have a copy of the garnishee's answer and a copy of the plaintiff's notice which takes issue with the answer served on the defendant. If the defendant is served copies of the garnishee's answer and the plaintiff's notice, the determination of the court as to the liability of the garnishee to the defendant will be binding on the defendant in any future action involving him and the garnishee whether or not the defendant participates in the trial of the issues raised by the garnishee's answer.