Indiana Code Title 31. Family Law and Juvenile Law § 31-15-2-17

Sec. 17. (a) To promote the amicable settlements of disputes that have arisen or may arise between the parties to a marriage attendant upon the dissolution of their marriage, the parties may agree in writing to provisions for:

(b) In an action for dissolution of marriage:

(c) The disposition of property settled by an agreement described in subsection (a) and incorporated and merged into the decree is not subject to subsequent modification by the court, except as the agreement prescribes or the parties subsequently consent.