Except as otherwise provided in section 598B.204, a court of this state shall not modify a child-custody determination made by a court of another state unless a court of this state has jurisdiction to make an initial determination under section 598B.201, subsection 1, paragraph "a" or "b", and either of the following applies:
Iowa Code § 598B.203
99 Acts, ch 103, §15
Referred to in §598B.202, 598B.204, 598B.208