Okla. Stat. tit. 12A, § 12A-1-9-405: Modification of assigned contract

MODIFICATION OF ASSIGNED CONTRACT

(a) A modification of or substitution for an assigned contract

is effective against an assignee if made in good faith. The

assignee acquires corresponding rights under the modified or

substituted contract. The assignment may provide that the

modification or substitution is a breach of contract by the

assignor. This subsection is subject to subsections (b) through (d)

of this section.

(b) Subsection (a) of this section applies to the extent that:

(1) the right to payment or a part thereof under an assigned

contract has not been fully earned by performance; or

(2) the right to payment or a part thereof has been fully

earned by performance and the account debtor has not received

notification of the assignment under subsection (a) of Section 1-9-

406 of this title.

(c) This section is subject to law other than this article

which establishes a different rule for an account debtor who is an

individual and who incurred the obligation primarily for personal,

family, or household purposes.

(d) This section does not apply to an assignment of a health-

care-insurance receivable.