Okla. Stat. tit. 69, § 69-1318: Correction of apportionment

The governing body of the city or the board of county

commissioners at such session, or at any adjournment thereof, shall

have the power to review, modify or correct the appraisement and

apportionment, and to raise or lower the same as to any lots or

parcels of land, as it shall deem just, and shall, by resolution,

confirm the same as so revised and corrected. At such session any

party interested may file objections in writing against the validity

or amount of any proposed assessment and shall have full opportunity

to be heard thereon; and any objections to the regularity of the

proceedings with reference to the construction of the improvements

or the validity or the amount of the assessment shall be waived

unless presented at the time and in the manner herein specified.