Okla. Stat. tit. 14A, § 14A-2-408: Cross-collateral

(1) In addition to contracting for a security interest pursuant

to the provisions on security in sales or leases (Section 2-407), a

seller in a consumer credit sale may secure the debt arising from

the sale by contracting for a security interest in other property if

as a result of a prior sale the seller has an existing security

interest in the other property. The seller may also contract for a

security interest in the property sold in the subsequent sale as

security for the previous debt.

(2) If the seller contracts for a security interest in other

property pursuant to this section, the rate of credit service charge

thereafter on the aggregate unpaid balances so secured may not

exceed that permitted if the balances so secured were consolidated

pursuant to the provisions on consolidation involving a refinancing

(subsection (1) of Section 2-206). The seller has a reasonable time

after so contracting to make any adjustments required by this

section. "Seller" in this section does not include an assignee not

related to the original seller.