R.J.B. Gas Pipeline Co. v. Colorado Interstate Gas Co., 813 P.2d 14 (Okla App. 1990) involved a dispute over a take or pay contract.
The Court held that the plaintiffs had to prove they were signatories to the contract or assignees of signatory parties because the judgment apportioned damages to each individual plaintiff.
The court refused to accept summaries of the division of interests in each well, but accepted uncontested oral testimony by some owners as to their ownership without requiring written documentation. Id. at 20.