Yon Mitori International Industries vs. Union Bank of the Philippines

A depositor who knowingly withdraws the proceeds of a dishonored check erroneously credited due to a bank's technical error is bound to return the funds under the principle of unjust enrichment, even if the bank's system error enabled the withdrawal, where the depositor was fully aware that the check would not be cleared and acted in bad faith.

Rodriguez Ong Tan, doing business under the name and style Yon Mitori International Industries, maintained a current account with Union Bank of the Philippines at its Commonwealth, Quezon City branch. Tan was a depositor whose account was used in the ordinary course of his business dealings with clients such as Angli Lumber & Hardware, Inc. Union Bank, as the collecting bank handling Tan's check deposits, was obligated to credit Tan's account only after the drawee bank paid the amount of the check or the check was cleared for deposit. The dispute arose from the interaction between these banking obligations and a system error that temporarily made funds available before clearance.

Rodriguez Ong Tan, doing business under the name and style Yon Mitori International Industries, maintained Current Account No. 027-03-000181-8 with Union Bank of the Philippines at its Commonwealth, Quezon City branch. On November 12, 2007, Tan deposited BPI Check No. 0180724 in the amount of ₱420,000.00, drawn against the account of Angli Lumber & Hardware, Inc., one of Tan's alleged clients. The deposit was entered in Tan's bank record, increasing his balance from ₱93,700.60 to ₱513,700.60.

In the morning of November 14, 2007, Tan withdrew ₱480,000.00 from the account. Later that day, the BPI Check was returned to Union Bank as the account against which it was drawn had been closed. Union Bank discovered that Tan's account had been mistakenly credited due to a technical error in its system, which had allowed the funds to be made available for withdrawal before the check was actually cleared. The branch manager immediately called Tan to recover the mistakenly released funds, but Tan refused, claiming the BPI Check proceeded from a valid transaction between Angli Lumber and Yon Mitori.

During its investigation, Union Bank discovered that Tan had previously deposited five other BPI checks drawn by Angli Lumber against the same BPI account, and all five had been dishonored. Tan himself admitted during cross-examination that Union Bank had notified him of the dishonor of all five prior checks for the reason "Account Closed" before he deposited the subject BPI Check. On November 20, 2007, Union Bank sent Tan a letter demanding reimbursement of ₱420,000.00, explaining that the funds had been inadvertently allowed due to a technical error prior to the actual return of the check deposit. Tan again refused. Union Bank then debited the remaining balance in Tan's account amounting to ₱34,700.60 and filed a Complaint for Sum of Money before the RTC to recover the remaining ₱385,299.40 plus consequential damages.

The RTC found all the requisites for solutio indebiti under Article 2154 of the Civil Code present and ordered Tan to return the amount, applying legal compensation to set off the erroneous payment against Tan's remaining deposit. The RTC also awarded attorney's fees and costs of suit. On appeal, the CA affirmed with modification, deleting the attorney's fees and costs of suit and reducing the legal interest rate from 12% to 6% per annum, finding that Union Bank's own technical error was the proximate cause of the unwarranted crediting and that Tan did not act in bad faith. Tan then filed the present Petition, naming Yon Mitori as sole petitioner.

• Proximate Cause / Gross Negligence: Petitioner maintained that the proximate cause of Union Bank's loss was its own gross negligence in allowing the withdrawal before the check was cleared, and that Union Bank is therefore barred from recovering damages under Article 2179 of the Civil Code.
• Inapplicability of Solutio Indebiti: Petitioner argued that the principle of solutio indebiti does not apply because the erroneous payment resulted from Union Bank's own negligence, not from a mere mistake of fact, relying on the Court's ruling in PNB vs. Cheah where it was held that no recovery is due "if the mistake done is one of gross negligence."
• Collecting Agent Liability: Petitioner contended that as collecting agent, Union Bank is responsible for losses arising from its own negligence pursuant to Article 1909 of the Civil Code, and should be held solely liable for its own loss, relying on Metrobank vs. CA.

• Unjust Enrichment: Respondent argued that allowing Tan to retain the proceeds of the dishonored BPI Check despite not being entitled thereto would permit unjust enrichment at Union Bank's expense, the dishonor of the check being undisputed.
• Collecting Bank's Obligation: Respondent maintained that as collecting bank, it was obligated to credit Tan's account only after the drawee bank paid the amount of the check or the check was cleared for deposit, and since the BPI Check was dishonored, Union Bank was under no obligation to effect payment in Tan's favor.

• Juridical Personality of Petitioner: Whether the Petition filed solely in the name of Yon Mitori, a single proprietorship, should be dismissed for lack of juridical personality or whether substitution of its owner Tan is permissible.
• Unjust Enrichment: Whether Tan is bound to return the proceeds of the dishonored BPI Check erroneously credited to his account under the principle of unjust enrichment.
• Applicability of PNB vs. Cheah: Whether the ruling in PNB vs. Cheah precludes Union Bank's recovery on the ground that the erroneous payment resulted from gross negligence rather than a mere mistake of fact.
• Article 1909 Liability: Whether Article 1909 of the Civil Code, as applied in Metrobank vs. CA, bars Union Bank from recovering and holds it solely liable for its own loss.

• Juridical Personality of Petitioner: Yes, substitution is permissible. A single proprietorship has no juridical personality separate from its owner, but the defect is merely formal and may be corrected under Section 4, Rule 10 of the 1997 Rules of Court.
• Unjust Enrichment: Yes. Tan is bound to return the proceeds of the dishonored BPI Check under the principle of unjust enrichment, having withdrawn the funds with full knowledge that the drawer's account had been closed.
• Applicability of PNB vs. Cheah: No. PNB vs. Cheah is inapplicable because Tan failed to substantiate his imputation of gross negligence, the technical error cannot be likened to the blatant procedural violation in that case, and unlike the depositor there, Tan himself retained and used the funds.
• Article 1909 Liability: No. Article 1909 does not preclude Union Bank's recovery because Tan did not suffer any loss from the technical error; on the contrary, he unduly gained from it, and his remedy lies against the drawer Angli Lumber, not against Union Bank.

• Juridical Personality of Petitioner: As a general rule, every civil action must be prosecuted in the name of the real party in interest. Under Section 1, Rule 3 of the 1997 Rules of Court, only natural and juridical persons or entities authorized by law may be parties in a civil action. A single proprietorship is not considered a separate juridical person under the Civil Code. The Petition was filed solely in the name of Yon Mitori, which has no juridical personality separate from its owner Tan. Nevertheless, the Court permitted the substitution of Tan as petitioner under Section 4, Rule 10, which allows summary correction of defects in the designation of parties at any stage of the action, provided no prejudice is caused to the adverse party. Following Juasing Hardware vs. Mendoza, the filing of a civil action in the name of a single proprietorship is merely a formal, not substantial, defect, and substitution would not change the identity of the parties or cause prejudice, since Tan had been consistently named as owner and operator throughout the proceedings.

• Unjust Enrichment: A collecting bank, defined as any bank handling an item for collection except the drawee bank, binds itself to credit the depositor's account only after the drawee bank has paid the amount of the check or the check is cleared for deposit. Union Bank stood as the collecting bank when Tan deposited the BPI Check. The dishonor of the BPI Check was undisputed, meaning Union Bank was under no obligation to effect payment in Tan's favor. Allowing Tan to retain the proceeds would permit unjust enrichment at Union Bank's expense. Under Article 22 of the Civil Code, every person who acquires or comes into possession of something at the expense of another without just or legal ground shall return the same. The two requisites — that a person is unjustly benefited and that such benefit is derived at the expense of another — were both present. Tan's transaction records showed he had previously deposited five other checks drawn against the same Angli Lumber account, all dishonored for "Account Closed," and Tan admitted during cross-examination that he was notified of these dishonors before depositing the subject BPI Check. Tan therefore knew the account was closed and could not have expected the check to be honored. His withdrawal of the proceeds soon after the erroneous credit, with knowledge of the account's closure, smacked of bad faith if not fraud. The circumstances paralleled Equitable Banking Corporation vs. Special Steel Products, Inc., where the Court allowed the bank's cross-claim against the party who unjustly benefited from the fraudulent scheme, even though the bank was negligent.

• Applicability of PNB vs. Cheah: In PNB vs. Cheah, the Court ruled that PNB was guilty of gross negligence because its own bank officer permitted the depositor to prematurely withdraw the proceeds of a check before the expiration of the 15-day clearing period mandated by PNB's own internal rules (PNB General Circular No. 52-101/88). Despite PNB's gross negligence, the Court tempered PNB's liability due to the depositor's contributory negligence, making the parties equally responsible for the loss. Tan's reliance on this case was misplaced for three reasons. First, Tan failed to substantiate his imputation of gross negligence, as he did not cite any specific provision of law, banking regulation, or internal rule violated by Union Bank; the record showed only a technical system error, not a blatant violation of internal procedure. Second, in PNB vs. Cheah, the depositor Ofelia did not benefit from the proceeds — she delivered them to a third party — whereas Tan withdrew and used the funds himself to pay a supplier. Third, allowing Tan to benefit from the erroneous payment would permit unjust enrichment, particularly given circumstances indicating bad faith in his withdrawal of the mistakenly released funds.

• Article 1909 Liability: In Metrobank vs. CA, the Court applied Article 1909 to hold Metrobank liable for losses suffered by Golden Savings as a result of Metrobank's negligence, because Golden Savings relied on Metrobank's assurance that the treasury warrants had been cleared and would not have allowed the withdrawals without such assurance. By invoking Article 1909, Tan appeared to assert that he, as principal-depositor, suffered losses because of the technical error in Union Bank's system. This assertion was false: Tan had no right to receive the proceeds of the BPI Check and therefore did not suffer any loss from the technical error. On the contrary, Tan unduly gained from the error, as it allowed him to withdraw and utilize funds to which he had no right. The fact that Tan received the BPI Check for value in the ordinary course of business did not negate his obligation to return the erroneously credited funds; his remedy, if any, lay against the drawer Angli Lumber, not against Union Bank.

• Unjust Enrichment (Article 22, Civil Code) — There is unjust enrichment when a person unjustly retains a benefit to the loss of another, or when a person retains money or property of another against the fundamental principles of justice, equity, and good conscience. The requisites are: (i) a person is unjustly benefited; and (ii) such benefit is derived at the expense of or with damages to another. The claimant must prove that another party knowingly received something of value to which he was not entitled and that it would be unjust for that person to keep the benefit. Applied here: Tan knowingly withdrew proceeds of a dishonored check he knew would not clear, satisfying both requisites.

• Solutio Indebiti (Article 2154, Civil Code) — The indispensable requisites are: (a) that he who paid was not under obligation to do so; and (b) that the payment was made by reason of an essential mistake of fact. No recovery is due if the mistake done is one of gross negligence. Distinguished here: the Court did not rely on solutio indebiti but on unjust enrichment, finding that the technical error could not be equated with the gross negligence in PNB vs. Cheah that precluded solutio indebiti.

• Single Proprietorship Has No Juridical Personality — A single proprietorship is not considered a separate juridical person under the Civil Code. Filing a civil action in the name of a single proprietorship is merely a formal, not substantial, defect, and may be corrected by substituting the owner as the real party in interest under Section 4, Rule 10 of the 1997 Rules of Court, provided no prejudice is caused to the adverse party. Followed from Juasing Hardware vs. Mendoza.

• Collecting Bank's Obligation — A collecting bank is any bank handling an item for collection except the drawee bank. Upon receipt of a check for deposit, the collecting bank binds itself to credit the amount in the depositor's account only after the drawee bank shall have paid the amount of the check or after the check is cleared for deposit. Before clearance, the collecting bank can only assume at its own risk that the check would be cleared and paid out.

• "Allowing Tan to retain the proceeds of the dishonored BPI Check despite not being entitled thereto would therefore permit unjust enrichment at Union Bank's expense." — This passage articulates the ratio decidendi: that the depositor's retention of erroneously credited funds from a dishonored check constitutes unjust enrichment warranting restitution.

• "No recovery is due if the mistake done is one of gross negligence." — This formulation from PNB vs. Cheah, quoted in the decision, defines the boundary of solutio indebiti: gross negligence, as opposed to an excusable mistake of fact, precludes recovery — a distinction the Court found inapplicable to Union Bank's technical error.

• "Tan's remedy, if any, lies not against Union Bank, but against the drawer of the BPI Check Angli Lumber." — This statement resolves the Article 1909 argument by clarifying that a depositor who receives proceeds of a dishonored check for value must seek recourse against the drawer, not the collecting bank, for the collecting bank's error did not cause the depositor any loss but rather an undue gain.

• "That Tan withdrew the proceeds of the BPI Check soon after discovering that the corresponding funds had been credited to his account despite his knowledge that the account from which the BPI Check was issued had been closed for some time smacks of bad faith if not fraud." — This passage establishes the bad faith finding that distinguishes the case from PNB vs. Cheah and underpins the unjust enrichment ruling.

• Philippine National Bank vs. Cheah Chee Chong, G.R. Nos. 170865 and 170892, April 25, 2012, 671 SCRA 49 — Distinguished. The Court held that PNB's gross negligence in allowing premature withdrawal before the 15-day clearing period precluded recovery under solutio indebiti, but the depositor's contributory negligence resulted in equal sharing of the loss. Distinguished because Tan failed to prove gross negligence comparable to PNB's blatant procedural violation, and unlike the depositor in that case, Tan retained and used the funds himself.

• Metropolitan Bank and Trust Company vs. Court of Appeals, G.R. No. 88866, February 18, 1991, 194 SCRA 169 — Distinguished. The Court applied Article 1909 to hold Metrobank liable for losses to Golden Savings caused by Metrobank's negligence in assuring clearance of treasury warrants. Distinguished because Tan did not suffer any loss from Union Bank's technical error but rather unduly gained from it.

• Equitable Banking Corporation vs. Special Steel Products, Inc., G.R. No. 175350, June 13, 2012, 672 SCRA 212 — Followed. The Court allowed the bank's cross-claim against the party who unjustly benefited from a fraudulent scheme, even though the bank was negligent. Applied to support the ruling that Tan must return the funds to Union Bank to prevent unjust enrichment.

• Juasing Hardware vs. Mendoza, No. L-55687, July 30, 1982, 115 SCRA 783 — Followed. The Court held that filing a civil action in the name of a single proprietorship is merely a formal defect, and substitution of the owner as party would not change the identity of the parties or cause prejudice. Applied to permit substitution of Tan as petitioner.

• University of the Philippines vs. Philab Industries, Inc., G.R. No. 152411, September 29, 2004, 439 SCRA 467 — Cited for the explication of unjust enrichment requisites, including the requirement that the claimant prove another party knowingly received something of value to which he was not entitled.

• Nacar vs. Gallery Frames, 716 Phil. 267 (2013) — Followed for the reduction of the legal interest rate from 12% to 6% per annum on the awarded sum, which is not a loan or forbearance of money.

• Article 22, Civil Code — Codifies the principle of unjust enrichment: every person who through an act or performance by another, or any other means, acquires or comes into possession of something at the expense of the latter without just or legal ground, shall return the same. Applied as the primary basis for ordering Tan to return the erroneously credited funds.

• Article 2154, Civil Code — Governs solutio indebiti, requiring that he who paid was not under obligation to do so and that payment was made by reason of an essential mistake of fact. The RTC applied this provision, but the Supreme Court relied primarily on unjust enrichment under Article 22.

• Article 1980, Civil Code — Provides that fixed, savings, and current deposits of money in banks and similar institutions shall be governed by the provisions concerning simple loan. The RTC relied on this to establish that Tan and Union Bank became mutual debtors and creditors, giving rise to legal compensation.

• Article 1909, Civil Code — Provides that principals are responsible for the acts of their agents acting within the scope of their assigned authority. Tan invoked this to argue Union Bank should bear its own loss as collecting agent, but the Court found it inapplicable since Tan suffered no loss.

• Article 2179, Civil Code — Addresses contributory negligence and its effect on damages. Tan invoked this to argue Union Bank's negligence barred recovery, but the Court found the provision inapplicable on the facts.

• Section 1, Rule 3, 1997 Rules of Court — Provides that only natural and juridical persons or entities authorized by law may be parties in a civil action. Applied to hold that Yon Mitori, as a single proprietorship, has no separate juridical personality.

• Section 4, Rule 10, 1997 Rules of Court — Authorizes summary correction of defects in the designation of parties and clerical errors at any stage of the action, provided no prejudice is caused. Applied to permit substitution of Tan as petitioner.

Peralta, C.J., Lazaro-Javier, Lopez, and Rosario, JJ., concurred.