Iowa Code § 651.7: Joinder and counterclaim.

A party may perfect or quiet title to property that is subject to a partition petition or request adjudication of a right of a party as to any matter originating from or connected to the property, including a lien between any parties. Except as permitted by this section, a joinder of any other claim to a partition petition shall not be permitted. A counterclaim to a partition petition shall not be permitted.