Okla. Stat. tit. 12A, § 12A-3-407: Alteration

ALTERATION

(a) "Alteration" means (i) an unauthorized change in an

instrument that purports to modify in any respect the obligation of

a party, or (ii) an unauthorized addition of words or numbers or

other change to an incomplete instrument relating to the obligation

of a party.

(b) Except as provided in subsection (c) of this section, an

alteration fraudulently made discharges a party whose obligation is

affected by the alteration unless that party assents or is precluded

from asserting the alteration. No other alteration discharges a

party, and the instrument may be enforced according to its original

terms.

(c) A payor bank or drawee paying a fraudulently altered

instrument or a person taking it for value, in good faith and

without notice of the alteration, may enforce rights with respect to

the instrument (i) according to its original terms, or (ii) in the

case of an incomplete instrument altered by unauthorized completion,

according to its terms as completed.