TERNUS, Justice.
Appellee, Rick Jamieson, agreed to a partial settlement of his claim. We must decide whether the pro tanto credit rule applies to the later judgment obtained by Jamieson against appellant, Walter Harrison, d/b/a Ginger’s Tavern. We conclude it does. However, because there is no double recovery under the facts of this case, Harrison is not entitled to a credit for the monies paid pursuant to the settlement. Therefore, we affirm the district court’s order denying a credit.
I. Background Facts and Proceedings.
Jamieson was injured in a fight that occurred in Harrison’s bar. He sued Harrison, alleging claims under the dram shop act and under a premises liability theory. See Iowa Code § 123.92 (1993) (imposing civil liability on dram shops for injuries caused by an intoxicated person).
Jamieson and Harrison agreed to a settlement of Jamieson’s dram shop claim. Harrison paid Jamieson $9000. The settlement agreement specifically reserved Jamieson’s premises liability claim.
The premises liability claim was tried to a jury resulting in a finding that both parties were fifty percent at fault. The jury found that Jamieson had suffered damages in the amount of $20,000. Pursuant to the comparative fault statute, Iowa Code chapter 668, the trial court reduced Jamieson’s damages by his percentage of fault and entered judgment against Harrison for $10,000. See Iowa Code § 668.3(1) (1993) (claimant’s damages must be reduced by “the amount of fault attributable to the claimant”).
After judgment, Harrison filed a motion for a credit of the $9000 settlement proceeds against the $10,000 judgment. The trial court denied the credit. Harrison appealed.
On appeal, Harrison challenges the district court’s refusal to allow a credit. He claims that the pro tanto credit rule applies and under that rule, he is entitled to a $9000 credit against the $10,000 judgment. Jamie-son argues that the dram shop claim and the premises liability claim are separate and distinct and therefore, no set off should be allowed under any rule permitting credits for settlements.
Although we agree with Harrison that the pro tanto credit rule governs the handling of the settlement proceeds here, that fact does not entitle him to a credit. Therefore, the district court was correct in denying his request for a $9000 credit against the judgment.
II. Scope of Review.
Whether the pro tanto credit rule applies is a question of law. Glidden v. German, 360 N.W.2d 716, 718 (Iowa 1984). We review the trial court’s decision on that question to correct errors of law. Iowa R.App.P. [781]*7814; see Dennis v. Christianson, 482 N.W.2d 448, 450 (Iowa 1992).
Once it is decided that the pro tanto credit rule governs this case, we must determine whether Harrison carried his burden to prove his right to a credit. See Knauss v. City of Des Moines, 357 N.W.2d 573, 576 (Iowa 1984) (the burden is on the defendant to establish his right to a credit). The trial court did not reach this factual question because it did not think the pro tanto credit rule applied. Nevertheless, the facts that are material to an application of the rule are undisputed. If the only dispute concerns the legal consequences flowing from undisputed facts, the issue is one of law, not of fact. Ottumwa Hous. Auth. v. State Farm Fire & Casualty Co., 495 N.W.2d 723, 726 (Iowa 1993). Therefore, we will review the undisputed facts to decide if Harrison carried his burden to establish his right to a credit. See Citizens First Nat’l Bank v. Hoyt, 297 N.W.2d 329, 332 (Iowa 1980).
III. Does the Pro Tanto Credit Rule Apply?
The parties agree that Jamieson’s premises liability claim was governed by the comparative fault statute. Under that statute, a proportionate credit rule applies to partial settlements of comparative fault cases. See Iowa Code § 668.7 (1993) (“the claim of the releasing person against other persons is reduced by the amount of the released person’s equitable share of the obligation”). On the other hand, the dram shop claim settled by the parties is not subject to the comparative fault statute. Slager v. H.W.A. Corp., 435 N.W.2d 349, 355 (Iowa 1989).
In Freeman v. Ernst & Young, 516 N.W.2d 835, 838 (Iowa 1994), we held that it was error for the court to assign a tortfeasor a percentage of fault for conduct not classified as “fault” under chapter 668. Consequently, we reversed the trial court’s judgment which had reduced the plaintiffs recovery by the amount of fault assessed to a party under a theory not subject to the comparative fault statute. Freeman, 516 N.W.2d at 839.
We think the same reasoning applies here. Because the dram shop claim could not result in a finding of fault under chapter 668, a settlement of that claim cannot be used as the basis for a proportionate credit under section 668.7. Nevertheless, we disagree with Jamieson’s assertion that the settlement proceeds need not be considered at all.
Traditionally, a defendant has been entitled to a dollar-for-dollar credit for monies received by a plaintiff from settling parties in compensation for the plaintiffs damages. Greiner v. Hicks, 231 Iowa 141, 146-47, 300 N.W. 727, 731 (1941). This pro tanto credit rule continues to apply to eases not within the scope of the comparative fault statute. Tratchel v. Essex Group, Inc., 452 N.W.2d 171, 181 (Iowa 1990). We can think of no reason this rule would not apply here where the proportionate credit rule of chapter 668 is inapplicable.
Although Harrison has successfully established the trial court’s error in refusing to apply the pro tanto credit rule, that error alone does not require us to reverse the court’s judgment. Citizens First Nat’l Bank, 297 N.W.2d at 332. If the trial court nevertheless reached the correct result, we must affirm. Id. “We are obliged to affirm an appeal where any proper basis appears for a trial court’s ruling, even though it is not one upon which the court based its holding.” Id. Therefore, although the trial court was incorrect in holding that the pro tanto credit rule was inapplicable, unless Harrison is entitled to a credit under the rule, the trial court did not err in failing to grant a credit.1
[782]*782IV. Did Harrison Carry His Burden to Prove His Entitlement to a Pro Tan-to Credit?
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TERNUS, Justice.
Appellee, Rick Jamieson, agreed to a partial settlement of his claim. We must decide whether the pro tanto credit rule applies to the later judgment obtained by Jamieson against appellant, Walter Harrison, d/b/a Ginger’s Tavern. We conclude it does. However, because there is no double recovery under the facts of this case, Harrison is not entitled to a credit for the monies paid pursuant to the settlement. Therefore, we affirm the district court’s order denying a credit.
I. Background Facts and Proceedings.
Jamieson was injured in a fight that occurred in Harrison’s bar. He sued Harrison, alleging claims under the dram shop act and under a premises liability theory. See Iowa Code § 123.92 (1993) (imposing civil liability on dram shops for injuries caused by an intoxicated person).
Jamieson and Harrison agreed to a settlement of Jamieson’s dram shop claim. Harrison paid Jamieson $9000. The settlement agreement specifically reserved Jamieson’s premises liability claim.
The premises liability claim was tried to a jury resulting in a finding that both parties were fifty percent at fault. The jury found that Jamieson had suffered damages in the amount of $20,000. Pursuant to the comparative fault statute, Iowa Code chapter 668, the trial court reduced Jamieson’s damages by his percentage of fault and entered judgment against Harrison for $10,000. See Iowa Code § 668.3(1) (1993) (claimant’s damages must be reduced by “the amount of fault attributable to the claimant”).
After judgment, Harrison filed a motion for a credit of the $9000 settlement proceeds against the $10,000 judgment. The trial court denied the credit. Harrison appealed.
On appeal, Harrison challenges the district court’s refusal to allow a credit. He claims that the pro tanto credit rule applies and under that rule, he is entitled to a $9000 credit against the $10,000 judgment. Jamie-son argues that the dram shop claim and the premises liability claim are separate and distinct and therefore, no set off should be allowed under any rule permitting credits for settlements.
Although we agree with Harrison that the pro tanto credit rule governs the handling of the settlement proceeds here, that fact does not entitle him to a credit. Therefore, the district court was correct in denying his request for a $9000 credit against the judgment.
II. Scope of Review.
Whether the pro tanto credit rule applies is a question of law. Glidden v. German, 360 N.W.2d 716, 718 (Iowa 1984). We review the trial court’s decision on that question to correct errors of law. Iowa R.App.P. [781]*7814; see Dennis v. Christianson, 482 N.W.2d 448, 450 (Iowa 1992).
Once it is decided that the pro tanto credit rule governs this case, we must determine whether Harrison carried his burden to prove his right to a credit. See Knauss v. City of Des Moines, 357 N.W.2d 573, 576 (Iowa 1984) (the burden is on the defendant to establish his right to a credit). The trial court did not reach this factual question because it did not think the pro tanto credit rule applied. Nevertheless, the facts that are material to an application of the rule are undisputed. If the only dispute concerns the legal consequences flowing from undisputed facts, the issue is one of law, not of fact. Ottumwa Hous. Auth. v. State Farm Fire & Casualty Co., 495 N.W.2d 723, 726 (Iowa 1993). Therefore, we will review the undisputed facts to decide if Harrison carried his burden to establish his right to a credit. See Citizens First Nat’l Bank v. Hoyt, 297 N.W.2d 329, 332 (Iowa 1980).
III. Does the Pro Tanto Credit Rule Apply?
The parties agree that Jamieson’s premises liability claim was governed by the comparative fault statute. Under that statute, a proportionate credit rule applies to partial settlements of comparative fault cases. See Iowa Code § 668.7 (1993) (“the claim of the releasing person against other persons is reduced by the amount of the released person’s equitable share of the obligation”). On the other hand, the dram shop claim settled by the parties is not subject to the comparative fault statute. Slager v. H.W.A. Corp., 435 N.W.2d 349, 355 (Iowa 1989).
In Freeman v. Ernst & Young, 516 N.W.2d 835, 838 (Iowa 1994), we held that it was error for the court to assign a tortfeasor a percentage of fault for conduct not classified as “fault” under chapter 668. Consequently, we reversed the trial court’s judgment which had reduced the plaintiffs recovery by the amount of fault assessed to a party under a theory not subject to the comparative fault statute. Freeman, 516 N.W.2d at 839.
We think the same reasoning applies here. Because the dram shop claim could not result in a finding of fault under chapter 668, a settlement of that claim cannot be used as the basis for a proportionate credit under section 668.7. Nevertheless, we disagree with Jamieson’s assertion that the settlement proceeds need not be considered at all.
Traditionally, a defendant has been entitled to a dollar-for-dollar credit for monies received by a plaintiff from settling parties in compensation for the plaintiffs damages. Greiner v. Hicks, 231 Iowa 141, 146-47, 300 N.W. 727, 731 (1941). This pro tanto credit rule continues to apply to eases not within the scope of the comparative fault statute. Tratchel v. Essex Group, Inc., 452 N.W.2d 171, 181 (Iowa 1990). We can think of no reason this rule would not apply here where the proportionate credit rule of chapter 668 is inapplicable.
Although Harrison has successfully established the trial court’s error in refusing to apply the pro tanto credit rule, that error alone does not require us to reverse the court’s judgment. Citizens First Nat’l Bank, 297 N.W.2d at 332. If the trial court nevertheless reached the correct result, we must affirm. Id. “We are obliged to affirm an appeal where any proper basis appears for a trial court’s ruling, even though it is not one upon which the court based its holding.” Id. Therefore, although the trial court was incorrect in holding that the pro tanto credit rule was inapplicable, unless Harrison is entitled to a credit under the rule, the trial court did not err in failing to grant a credit.1
[782]*782IV. Did Harrison Carry His Burden to Prove His Entitlement to a Pro Tan-to Credit?
The policy reflected in the pro tanto credit rule is “that the plaintiff should receive no more than has been lost as the result of some tortious act.” Thomas v. Solberg, 442 N.W.2d 73, 74 (Iowa 1989); accord Greiner, 231 Iowa at 146-47, 300 N.W. at 731. It is designed to prevent a double recovery by the injured party. Thomas, 442 N.W.2d at 74; Knauss, 357 N.W.2d at 578. Consistent with these principles, we have held that the defendant must “show that without such a credit the plaintiff would receive more than full compensation for his injuries-” Knauss, 357 N.W.2d at 578.
Our analysis in the Knauss case is instructive here. In Knauss, the plaintiff was injured in a one-car accident and was immediately arrested and put in jail. Id. at 575. He later sued the driver of the ear for negligent operation of the vehicle. Id. The plaintiff also brought an action against the city for negligently jailing him without providing adequate medical care. Id. Before trial the plaintiff settled with the driver for $10,000. Id.
The jury returned a verdict for $12,000 against the city and the trial court denied the city’s request for a $10,000 credit against the verdict. Id. We affirmed the trial court’s refusal of a credit because the city had not proved that the plaintiff would receive more than he could have recovered for his injuries. Id. at 579. We explained our decision in this way:
Although the plaintiff may have sustained a single injury as a result of the negligent acts of two tortfeasors, the damages he could recover from each of the two were not the same. From the city plaintiff was only allowed to recover for the physical pain and suffering incurred during the time he was denied medical attention. From [the driver] he could have recovered for (but instead settled his claim for) such other items as medical and hospital bills, disability, and pain and suffering. Because the city did not establish in this record what amount would fairly represent full compensation for the combined injuries sustained by plaintiff as a result of both tortfeasors’ actions, the city failed to prove a critical element for establishing its right to a pro tanto credit. We are unwilling to assume that $22,000 is a greater sum than a jury would have awarded plaintiff for all his injuries....
... The city has entirely failed to establish that the $22,000 plaintiff has received exceeds the total damages he would have been entitled to recover had the verdict measured all of the injuries he incurred as a result of the collision and its aftermath.
Id. at 578-79.
This reasoning is relevant here because Jamieson’s potential recovery under the dram shop act differed from his recovery under the premises liability theory. Under the dram shop act he would have been entitled to recover all of his damages with no reduction for his own comparative fault. Slager, 435 N.W.2d at 358 (comparative fault is not a defense to a dram shop action). Unlike the Knauss case, we need not guess what the amount of this recovery might have been here. The jury has established Jamie-son’s damages as $20,000. Consequently, had Jamieson successfully tried his dram shop case, he would have been entitled to a judgment of $20,000, the full amount of his damages. However, Jamieson’s recovery under the premises liability theory was less because his comparative fault was a defense to that claim. Consequently, the trial court reduced his damages of $20,000 by the amount of his fault, resulting in a judgment for $10,000.
In arguing for a credit, Harrison focuses on Jamieson’s judgment. He concludes that allowing Jamieson to recover the $10,000 judgment and keep the $9000 settlement would result in double recovery because $19,-000 exceeds the $10,000 judgment. But the focus should not be on the judgment; it should be on the damages actually sustained [783]*783and recoverable. That is the focus we took in Knauss and in a later ease, Waukon Auto Supply v. Farmers & Merchants Savings Bank, 440 N.W.2d 844 (Iowa 1989). In Knauss we looked at the amount that the plaintiff could have recovered had he pursued his settled claim. Knauss, 357 N.W.2d at 578. Similarly in Waukon Auto, we focused on the total damages sustained by the plaintiff rather than the amount recovered in the judgment at issue. Waukon Auto, 440 N.W.2d at 851 (plaintiff sustained losses of $35,000, settled with one party for $5800 and received a judgment for $25,160.79; held no double recovery because total of settlement and judgment ($30,960.79) was less than $35,-000 damages).
We take the same approach here. Focusing on Jamieson’s recoverable damages of $20,000, it is readily apparent that there is no double recovery if the settlement of $9000 does not exceed his damages of $20,000. Therefore, there is no double recovery and Harrison is not entitled to a credit.
Harrison has failed to prove that the trial court erred in refusing his motion for a credit. Therefore, we affirm the district court.
AFFIRMED.
All justices concur except HARRIS, J., and McGIVERIN, C.J., who dissent.