Ohio Rev. Code Ann. § 1335.11
(A) As used in this section:
(2) "Principal" means a person who does all of the following:
(a) Engages in either of the following:
(B) For purposes of this section, the time at which a commission is due to a sales representative shall be determined in the following manner:
(F) Any provision in any contract between a sales representative and principal is void if it purports to do any of the following: