dissenting.
Intervenor Salt Fork Development Corporation appeals the order overruling its motion for new trial of a summary judgment in favor of Veldon Woolley, Verlin Woolley, and Shirley Woolley. Having reviewed the record and applicable law, I would reverse and remand.
The controversy in this case involves two parcels of property in Payne County. The first and primary tract is a five-acre strip described as the east half of the northeast quarter of the northwest quarter of the northeast quarter of section 15. The second is eighty acres in size and encompasses the entire north half of section 15, including the five-acre tract.
In 1978, Veldon Woolley joined with other mortgagors to mortgage the five-acre property in exchange for a $150,000 commercial loan from Stillwater National Bank. It is undisputed that the purpose of the loan was to construct a club called “The Kaleidoscope,” and that, at the time the loan was made, construction plans called for a gravel parking lot for the club. The mortgagors subsequently mortgaged the entire eighty acres to the Security *378State Bank of Mooreland in exchange for funding to pave the lot.
When the mortgagors defaulted, Stillwa-ter National Bank obtained a judgment and order of foreclosure and sale of the five-acre tract. John Pounds, as agent for Salt Fork Development Corporation, purchased the property for $225,000. This sale was confirmed on May 17, 1984.
Subsequent to its purchase of the property, Salt Fork discovered that the parking lot as paved exceeded the bounds of the five-acre tract. In March 1985 Salt Fork filed a petition in intervention, seeking reformation of the sheriffs deed and underlying mortgage. It alleged that, because of mutual mistake or unilateral mistake and fraud, the mortgage description was erroneous, as it had been the intent of the parties to recite a security interest “in and to all of the improvements placed upon the above described property and or upon the Northwest Quarter (NW/4) of the Northeast Quarter (NE/4), pertaining to or in anyway [sic ] connected with that certain business commonly known and operated under the name of 'Kaleidoscope,'” and that Veldon Woolley and his co-mortgagors had represented to Stillwater National that all of such improvements were located on the five-acre tract. Verlin and Shirley Woolley were named as owners of the surrounding eighty-acre parcel. In addition to reformation, Salt Fork sought injunctive relief against the three Woolleys from going upon the property in question or otherwise depriving Salt Fork of its rights to it.
Stillwater National admitted Salt Fork’s allegations and joined in asserting that it was the intention of both the bank and Woolley to include “all of the property upon which the Kaleidoscope and any related improvements were located” within the mortgage description.
The Woolleys denied Salt Fork’s petition, asserted various affirmative defenses, and filed cross-petitions seeking actual and punitive damages against Salt Fork arising from its use and possession of the property. They then moved for summary judgment on Salt Fork’s claim, claiming as un-controverted the following material facts: (1) The real estate mortgage, Stillwater National Bank petition, notice of lis pen-dens, special execution and notice of sale, sheriff’s notice of sale, proof of publication, order approving sale, and sheriff’s deed all contained the same legal description of the mortgaged property; (2) in November 1978 Stillwater National had obtained a registered land survey showing a portion of the parking lot exceeding the boundaries of the mortgaged property; (3) Stillwater National never sought reformation of the mortgage so as to include the entire parking lot; (4) John Pounds conducted only a visual inspection of the property prior to purchase, and neither inquired about the property nor received any information regarding it at the foreclosure sale; (5) another Salt Fork agent, Robert M. Herlihy, received an independent appraisal of the property from a Stillwater realtor but conducted no further inspection of the property prior to sale; and (6) Salt Fork did not discover the misdescription until two months after the sale.
Salt Fork responded by producing evidence to show the following facts: (1) The Stillwater National loan was for the purpose of building the Kaleidoscope club, including its improvements; (2) Veldon Wool-ley did not intend to omit any portion of the improvements at the time he mortgaged the property; (3) at the time the lot was built, Veldon Woolley knew it exceeded the bounds of the mortgaged property and told Security State Bank but failed to advise Stillwater National; (4) Salt Fork did not become aware of the parking lot problem until July 1984; (5) the independent appraisal obtained by Herlihy showed one acre of paved parking; (6) Woolley made remarks to Herlihy indicating that Woolley did not know until 1984 that the lot exceeded the mortgaged boundaries; (7) according to the Stillwater National loan officer, Tom Bennett, both the bank and Woolley intended at the time the mortgage was executed that all improvements relating to the Kaleidoscope be included within the legal description upon which the mortgage was granted; (8) although Stillwater National obtained a survey of the property, it was done as a procedural matter and was *379not reviewed; and (9) Stillwater National was not aware of the discrepancy until after the sheriffs deed had been issued to Salt Fork.
The trial court granted Woolleys’ motion for summary judgment and denied Salt Fork’s subsequent motion for new trial. It found that Salt Fork’s title related back to that of Stillwater National; that the Wool-leys were to use the loan to construct the Kaleidoscope; that at the time of construction, a gravel lot was contemplated; that the Woolleys later paved the lot with proceeds of a loan from Security State Bank, for which the eighty-acre lot was mortgaged; and that the parking lot extended beyond the boundaries described in the Stillwater National mortgage. The court concluded from this that “there is no dispute regarding the issue of mutual mistake or fraud by the Defendants Wooley [sic] and mistake by the Plaintiff, Stillwater National Bank and Trust Company.” From this order, Salt Fork has appealed.
On review of a grant of summary judgment, this court will view all inferences and conclusions to be drawn from the underlying facts in the light most favorable to the party opposing the motion. Rose v. Sapulpa Rural Water Co., 631 P.2d 752, 754 (Okla.1981). A motion for summary judgment may be sustained only if no question concerning any material fact remains to be determined. Garner v. Johnson, 609 P.2d 760, 762-63 (Okla.1980). However, the trial court’s ruling must be made on the record which the parties have actually presented and not on a record which is potentially possible. Northrip v. Montgomery Ward & Co., 529 P.2d 489, 494 (Okla.1974).
Where a written instrument does not accurately reflect the parties’ agreement, it may be reformed by a court of equity. Boettler v. Rothmire, 442 P.2d 511, 514-15 (Okla.1968). Parol evidence is admissible in reformation cases based on mutual mistake, as the oral testimony is not offered to alter the parties’ agreement but rather to show that the language memorializing that agreement is not accurate. Fabbro v. Reese, 206 Okla. 655, 655-56, 246 P.2d 324, 325 (1952).
Addressing the issues raised by the parties in their briefs, I first find that the affidavit and deposition testimony presented by Salt Fork concerning the mutual intent of the parties and/or Woolley’s knowledge of the lot boundaries at the time of the mortgage’s execution raise controverted material facts sufficient to defeat summary judgment. Contrary to Wool-leys’ contentions, Salt Fork, as the party opposing summary judgment, was not required in its response to Woolleys’ motion, to prove its case by clear and convincing evidence, but was only required to show that it would “be able at the time of trial to present competent, admissible evidence to support [its] allegations.” Davis v. Leitner, 782 P.2d 924, 926 (Okla.1989).
Woolleys also contend that, even if Salt Fork could carry its burden of proof regarding mutual mistake, it is barred from recovery by Stillwater National’s negligence in failing to inspect the post-mortgage survey. “ ‘[N]egligence is not in itself a defense, else there would be no ground for reformation for mistake, as mistakes nearly always presuppose negligence.’ ” Home Stake Prod. Co. v. Trustees of Iowa College, 331 F.2d 919, 921 (10th Cir.1964) (quoting Columbian Nat’l Life Ins. Co. v. Black, 35 F.2d 571, 575 (10th Cir.1929)). While negligence of a party seeking to reform a written agreement may bar equitable relief, this does not demand the highest possible care; rather, the neglect must amount to the violation of a positive legal duty. 15 O.S.1981 § 63; Crabb v. Chisum, 183 Okla. 138,139-40, 80 P.2d 653, 655 (1938). Such negligence is an issue of fact to be determined by the trial court. Id.
Further, for this doctrine to apply, the negligence complained of must relate to a party’s entry into an erroneous agreement. Negligence occurring after the execution of the document would not bar invocation of mutual mistake, but rather would relate to a statute of limitations or laches argument. Woolleys have offered no evidence showing that, at the time the mortgage *380was executed, Stillwater National was negligent in accepting the mortgagors’ description of the property as encompassing the entirety of the planned construction and improvements.
Woolleys further rely on the doctrine of caveat emptor to make the related argument that Salt Fork was negligent in its inspection of the property, failing to discover the alleged misdescription prior to purchase. The doctrine of caveat emptor, however, relates to inspection of the chain of title in order to ascertain the seller’s true interest in the property. Such an inspection would not have revealed the flaw of which Salt Fork and Stillwater National now complain. The failure to have a survey made prior to purchase does not constitute negligence as a matter of law so as to bar reformation. See, e.g., Leimkuehler v. Shoemaker, 329 S.W.2d 726 (Mo.1959); see generally 66 Am.Jur.2d Reformation of Instruments § 87 (1973).
Finally, Woolleys’ argument that lack of privity bars Salt Fork’s right to reformation is without merit. The purchaser of land at a foreclosure sale may have errors in his deed and in the underlying mortgage corrected by reformation. 66 Am.Jur.2d Reformation of Instruments § 61 (1973); 55 Am.Jur.2d Mortgages § 847 (1971).
I disagree with the majority’s conclusion that, as a blanket proposition of law, a sheriff’s deed is impervious to equitable reformation. First, taking Salt Fork’s allegations as true, both parties to the mortgage continued under the mistaken impression that the mortgage, foreclosure petition, and sheriff’s deed included the entire Kaleidoscope parking lot and not just the portion actually described. However, they did not object to the amount ultimately appraised as the fair market value of what they mistakenly thought was the entire Kaleidoscope tract. Second, where, as here, the misdescription was allegedly the product of fraud on the part of the mortgagor, it is difficult to see the inequity in divesting him of the actual property which he led the mortgagee to believe secured the loan proceeds. Third, as discussed above, it is possible that none of the parties were negligent or breached a legal duty in failing to discover the misdescription prior to the sheriff's sale; it is again difficult to see the equity in barring them from a remedy prior to their discovery of the problem. A more equitable solution to the issue raised by the majority would be for the trial court to reform the underlying mortgage and then either order a new foreclosure and sale or allow the trial court to determine whether, in equity, a new foreclosure and sale is warranted. There is ample authority for such an approach. See, e.g., Annotation, Right, After Foreclosure, to Reformation on Ground of Erroneous Description Originating in Mortgage, 172 A.L.R. 655 (1948), and cases cited therein.
I would therefore find that the trial court erred in determining that the issues of mistake or fraud by Woolleys and mistake by Stillwater National were undisputed and in determining'that Woolleys were entitled to summary judgment against Salt Fork. As the judgment was erroneously granted, I would reverse the order overruling Salt Fork’s motion for new trial and remand the case to the trial court.