Ohio Rev. Code Ann. § 1306.07
(B) If a law other than sections 1306.01 to 1306.23 of the Revised Code requires a record to be posted or displayed in a certain manner, to be sent, communicated, or transmitted by a specified method, or to contain information that is formatted in a certain manner, all of the following apply:
(D) Divisions (A), (B), and (C) of this section may not be varied by agreement, except as follows: