Ohio Rev. Code Ann. § 1782.432
(B) The agreement of merger or consolidation shall set forth all of the following:
(E) At any time before the filing of the certificate of merger or consolidation pursuant to section 1782.433 of the Revised Code, the merger or consolidation may be abandoned by the general partners of any constituent partnership, the directors of any constituent corporation, or the comparable representatives of any other constituent entity if the general partners, directors, or comparable representatives are authorized to do so by the agreement of merger or consolidation. The agreement of merger or consolidation may contain a provision authorizing the general partners of any constituent partnership, the directors of any constituent corporation, or the comparable representatives of any other constituent entity to amend the agreement of merger or consolidation at any time before the filing of the certificate of merger or consolidation, except that after the adoption of the agreement of merger or consolidation by the limited partners of any constituent domestic limited partnership, the general partners shall not be authorized to amend the agreement of merger or consolidation to do any of the following: