Okla. Stat. tit. 69, § 69-1328: Setting aside assessments - Limitations

(a) No suit shall be sustained to set aside any assessment or to

enjoin the governing body of any city or the board of county

commissioners from levying or collecting any such assessment or

installment thereof or interest or penalty thereon, or issuing the

bonds, or providing for their payment or contesting the validity

thereof on any ground, or for any reason, other than for failure of

such governing body or such board to adopt and publish the

resolution declaring the necessity for the improvements and

publication thereof, and to give notice of the hearing on the return

of the appraisers unless the suit shall be commenced not more than

fifteen (15) days after the date of the last publication of the

ordinance levying assessments.

(b) No suit shall be sustained after the work has been completed

and accepted by the city or county except for failure to give such

notice of the preliminary resolution of necessity or failure to give

the notice of the hearing on such return of the appraisers.

(c) However, in the event any special assessment shall be found

to be invalid or insufficient in whole or in part, for any reason

whatever, the governing body or board of county commissioners may at

any time in such manner provided for levying an original assessment

proceed to cause a new assessment to be made and levied, which shall

have like force and effect as an original assessment.