Can a marital settlement agreement be modified by a judge?

In the case of Seawell v. Hargarten, 28 So.3d 152 (Fla. 1st DCA 2010), the district court held the Final Judgment didn't contain a reservation of jurisdiction clause so the court lacked authority to change the marital settlement agreement.

The parties entered into a Consent Final Judgment which, in pertinent part, required the Husband to pay to the Wife a total of $65,470 in cash and to also transfer to the Wife 50% of the shares of an Oppenheimer Mutual Fund. The Husband was required to do so by August 1st. Prior to the deadline, the Husband sent the Wife two checks totaling $24,700 and $24,327, thus leaving a balance owed of $16,443 as to the cash payment. On July 31st, the Husband sent a letter authorizing his broker to transfer 100% of the shares in the mutual fund to the Wife. At the time, the Fund had a value of $29,477.84. In other words, the Husband was attempting to apply the cash value of his 50% of the Fund ($14,738.92) toward the outstanding balance due on the required cash payment. Before he authorized the transfer of the Fund, the Husband had advised his counsel that he did not have enough cash to pay the $16,443 owed to the Wife. An exchange of emails then took place between the parties' counsel. The Husband's attorney asked the Wife's attorney if she would accept stock from the Fund toward the outstanding balance and the Wife's attorney replied that it did not matter how the Wife got her money "as long as she got all of it." On August 1st, the Wife wrote to the broker of the Fund accepting only her 50% of the Fund. Since the two authorization letters did not match, the broker did not transfer any shares of the Fund to the Wife. The Wife then filed an enforcement motion which the trial court denied, finding that the Wife could have accepted the Husband's offer to transfer the entire Fund to her. The District Court reversed:

1. "A property settlement agreement that has been incorporated into a final judgment of dissolution of marriage is non-modifiable, regardless of either party's financial position."

2. "Here, the property settlement agreement was incorporated into the Final Judgment. Because the Final Judgment did not contain a reservation of jurisdiction, the trial court lacked authority to change the terms of contract the parties had agreed to and the court had adopted."