Dаle E. Gruber appeals from an order of the district court for Douglas County granting the application of Dona M. Gruber, now known as Dona M. Witters, to modify a 1995 decree dissolving their marriage and dividing the marital property. The district court determined that in order to avoid a gross inequity, it was necessary to modify the decree to provide for the division of Gruber’s pension as originally agreed by the parties. Finding no abuse of discretion, we affirm.
FACTS
The marriage of Gruber and Witters was dissolved pursuant to a decree of dissolution on August 3,1995. The decree divided marital property pursuant to the terms of a settlement agreement negotiated by both parties and thеir respective counsel. The decree provision at issue provided:
IT IS FURTHER ORDERED, ADJUDGED AND DECREED that the retirement plan at the City of Omaha Firefighters in the approximate sum of $58,138.02 in the name of [Gruber] shall be equally divided between [Gruber] and [Witters] as of the 20th day of July, 1995 and that said division shall [be] done by a Qualified Domestic Order.
The referenced qualified domestic relations order (QDRO) was entered by the court on the same day and provided for an equal division of Gruber’s pension as of July 20, 1995.
Subsequent to the entry of the decree and the QDRO specified therein, Witters learned that the board of trustees of the “City of Omaha Police and Fire Retirement System” would not recognize the QDRO and refused to divide Gruber’s pension as required by the decree. After adding Omaha’s police and fire retirement system as a party to the divorce action pursuant to an agreement of the parties, Witters filed an “Application for Order” on January 29,1997. This application sought an order requiring the board of *916 trustees to implement division of Gruber’s pension in accordance with the decree and the QDRO. In an order dated June 20,1997, the district court determined that it did not have jurisdiction to grant such relief in the context of a dissolution proceeding and dismissed the application with prejudice.
Thereafter, on May 28, 1999, Witters filed an application for modification of decree. An evidentiary hearing on the application was held on January 28, 2000. Paul Murphy, the benefits manager for Omaha’s police and fire retirement system, testified on behalf of Witters. According to Murphy, the city of Omaha does not accept QDRO’s because it is a governmental entity exempt from the provision of the Employee Retirement Income Security Act of 1974. Murphy testified that because the city had been presented with numerous QDRO’s attempting to divide pensions, its law department developed language for incorporation into dissolution decrees in order to accomplish a division of city pension benefits between the parties to a dissolution proceeding. This occurred subsequent to the entry of the original decree in this case. Murphy testified that the only means to ensure that Witters received her share of the pension as set forth in the decree would be to incorporate the language developed by thе city into the decree. He testified that a supplement to the decree, exhibit 4, contained the necessary language authorizing the city to award Witters the pension benefits as delineated in the decree.
On cross-examination, Murphy testified that the city’s law department received numerous calls from attornеys seeking advice on the proper treatment of pension benefits in divorce decrees prior to the development of the language. He admitted that it was possible the board of trustees could in the future decide to honor QDRO’s, as they were not legally prevented from doing so, but indicated that such a changе was unlikely.
Witters testified that when she agreed to the property settlement, it was her understanding that she would receive one-half of the amounts Gruber had contributed to his pension at that time and that she would not have agreed to the settlement without this provision. She testified that she bargained for the pension to be equally divided аs of July 20, 1995, and that she did not learn of the possibility that she could receive none of the pension moneys *917 until after the decree was entered. On cross-examination, she stated that she understood she would receive one-half of the pension contributions made as of the date of dissolution, plus interest. She admitted that thе decree provided that this would be accomplished through a QDRO. She further admitted that she specifically informed the judge at the time the property settlement was entered into that she accepted the agreement.
Gruber testified that he is currently a fire captain for the city of Omaha. Gruber stated that at the time of the settlement negotiations, he offered to pay Witters one-half of the value of the pension in a lump sum, but she declined because she wanted her one-half interest to remain in the pension system. Gruber testified that it was his intention to have the decree divide the pension so that he would have one-half of the contributions in his name in the pension system and she would have one-half of the contributions in her name in the system. He further stated that he now wants “what’s fair” and that he did not agree at the time of the decree that Witters should receive none of the pension moneys. On cross-examination, he again stated the decree was their understanding of the agreement and that Witters wanted to become a member of the pension system through the QDRO.
After taking the matter under advisement, the district court entered an order granting Witters’ application to modify on February 9, 2000. The district court found that as part of their property settlement in 1995, the parties agreed that Witters was to receive one-half of Gruber’s pension as of July 20, 1995. It further found that Witters would receive no part of the pension unless the decree was modified. The court reasoned that to deny Witters her one-half interest in the pension because the retirement plan would not accept a QDRO would be grossly unfair and accordingly granted the application to modify. On March 2, the district court entered a supplement to the decree of dissolution based upon the language developed by the city of Omaha, which provided for the one-half division of Gruber’s pension benefits as of July 20, 1995. Gruber filed this timely appeal.
ASSIGNMENTS OF ERROR
Gruber assigns, restated, that the trial court erred (1) in not applying the doctrine of res judicata, (2) in finding a material *918 change in circumstances not within the reasonable contemplation of the parties at the time of the decree, and (3) in modifying the decree based on a finding of gross inequity.
STANDARD OF REVIEW
The applicability of res judicata presents a question оf law, requiring an appellate court to reach a conclusion independent of that of the lower court.
Ryan
v.
Ryan,
Modification of a dissolution decree is a matter entrusted to the discretion of the trial court, whose order is reviewed de novo on the record, and which will be affirmed absent an abuse of discretiоn by the trial court.
Reinsch v. Reinsch,
ANALYSIS
Res Judicata
Gruber first argues that the district court erred in not finding that Witters’ application for modification was barred by the doctrine of res judicata. He contends that the court’s ruling on her 1997 application for an order directing the board of trustees to comply with the decree precludes the present action.
Under the traditional rule of res judicata, sometimes called claim preclusion, any rights, facts, or matter in issue directly adjudicated or necessarily involved in the determination of an action before a competent court in which a judgment or decree is rendered
upon the merits
is conclusively settled by the judgment therein and cannot again be litigated by the parties and privies.
Schuelke
v.
Wilson,
Modification of Property Settlement
It is undisputed that the division of Gruber’s pension set forth in the decree was the result of a property settlement agreement entered into by the parties. Where parties to a divorce
*919
action voluntarily execute a property settlement agreement which is approvеd by the dissolution court and incorporated into a divorce decree from which no appeal is taken, provisions dealing with division of pension benefits will not thereafter be vacated or modified in the absence of fraud or gross inequity.
Reinsch
v.
Reinsch, supra.
See,
Hoshor
v.
Hoshor,
Gruber argues there is no gross inequity present for two reasons. First, he contends that it was “well within the power of [Witters] to create the necessary language in the consent decree of 1995.” Brief for appellant at 15. The record reveals, and the district court found, that the language drafted by the city of Omaha to assist attorneys in dividing pensions in divorce decrees did not exist in 1995. Nevertheless, Gruber argues that Witters could havе contacted the city for assistance in drafting the agreement.
In support of this argument, Gruber cites
Pascale
v.
Pascale, supra,
and
Robbins
v.
Robbins,
In
Robbins v. Robbins, supra,
the parties voluntarily entered into a property settlement agreement awarding the wife $20,000 in lieu of her interest in the husband’s pizza business. When the husband subsequently sold the business and incurred a substantial tax liability, he sought modification of the decree, contending that the wife “obtained an unconscionable advantage due to his ignorance concerning the tax consequences of the sale of the business.”
Id.
at 963,
Gruber argues that
Pascale
and
Robbins
control the instant case and bar modification of the decree because it was within the reasonable contemplation of Witters at the time the settlement agreement was made to properly draft the language incorporаted in the decree. He contends that because she failed to do so at the time, there is no justification for now modifying the decree in order to correct the error. Both
Pascale
v.
Pascale, supra,
and
Robbins
v.
Robbins,
Gruber also argues that the district court erred in modifying the decree because denying Witters her approximately $29,000 interest in the pension does not result in an inequitable distribution of property betweеn the parties. He contends that “[t]he issue that this Court must determine is whether or not $29,069.01 is gross [sic] inequitable if not awarded to [Witters].” Brief for appellant at 16. In support of this argument, he again relies on
Pascale
and
Robbins
and further cites
Hoshor v. Hoshor,
In
Pascale,
we held that the $26,672 incurred by the husband in tax liability as a result of the agreement he voluntarily entered into did not result in a division of property that was grossly inequitable. In
Robbins,
we similarly held that a $37,000 tax liability incurred by the husband as a result of a voluntary property settlement agreement was not grossly inequitable. In
Hoshor,
we addressed the division of a husband’s pension benefits set forth in a property settlement agreement reached by the parties and incorporated into the decree. The provision of the consent decree at issue provided that “ ‘[the husband] is the beneficiary of a pension and retirement plan .... [The wife] should receive one-fourth of any payments received from the pension and retirement plan by [the husband] аt the time such payments are received.’ ”
Id.
at 745,
*922
Gruber contends that
Pascale
v.
Pascale,
Based on the record before us, particularly the undisputed evidence that both parties intended to divide the pension equally as of July 20, 1995, we conclude that the district court did not abuse its discretion in finding that gross inequity would result in the absence of modification of the decree. The judgment of the district court is therefore affirmed.
Affirmed.
