Okla. Stat. tit. 11, § 11-36-223: Setting aside assessments - Limitation on suits

No suit may be sustained to set aside any assessment, nor to

contest the area of assessment, nor to enjoin the municipal

governing body from levying or collecting any 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 unless such suit shall be commenced not more

than fifteen (15) days after the publication of the ordinance

levying assessments. After the fifteen-day period has expired, or

after the work has been completed and accepted by the municipality,

a suit may be brought only for the failure of the governing body to

adopt and publish the resolution declaring the necessity for the

improvements, as provided in Sections 36-204 and 36-205 of this

title, or for the failure to give notice of the hearing on the

assessment roll, as provided in Section 36-214 of this title. If

any special assessment shall be found to be invalid or insufficient,

in whole or in part, for any reason whatever, the governing body at

any time, in the manner provided for levying an original assessment,

may proceed to cause a new assessment to be made and levied which

shall have like force and effect as an original assessment.