Okla. Stat. tit. 12, § 12-931: Several actions on joint instrument

Where several actions are brought on one bill of exchange,

promissory note or other obligation, or instrument in writing,

against several parties who might have been joined as defendants in

the same action, no costs shall be recovered by the plaintiff in

more than one of such actions, if the parties proceeded against in

the other actions were, at the commencement of the previous action,

openly within the state.