(1) A plan of merger must be consented to by all of the partners of a constituent partnership. The consents required by this subsection must be in, or evidenced by, a record.
(2) Subject to s. 620.8920 and any contractual rights, after a merger is approved, and at any time before a filing is made under s. 620.8918, a constituent partnership may amend the plan or abandon the planned merger:
(a) As provided in the plan.
(b) Except as prohibited by the plan, with the same consent as was required to approve the plan.