Novation and the Parol Evidence Rule in Philippine Contract Law

In ACI Philippines, Inc. v. Coquia (G.R. No. 174466, July 14, 2008), the Supreme Court clarified two fundamental principles of Philippine contract law: when a subsequent agreement effectively novates an earlier one, and when courts may look beyond the four corners of a written contract. The case involved a dispute over the price and quantity of flint cullets—recycled glass used in fiberglass manufacturing—and offers practical guidance for businesses that rely on purchase orders.

Facts of the Case

ACI Philippines, Inc. manufactured fiberglass and needed flint cullets as raw material. In October 1994, it issued Purchase Order No. 106211 to supplier Editha C. Coquia for one lot of 2,500 to 3,000 metric tons at P4.20 per kilo. Several deliveries were made and paid at that price.

Days later, ACI demanded a price reduction to P3.65 per kilo. Coquia acceded, and ACI issued Purchase Order No. 106373, which expressly stated it superseded the earlier order. Coquia made further deliveries under the new order, but ACI refused to pay, demanding an even lower price of P3.10 per kilo. Coquia sued for specific performance and damages.

The Issue

The central questions were whether the second purchase order effectively novated the first, and whether the trial court correctly excluded evidence showing that prompt delivery was a vital condition of the agreement.

The Ruling

The Supreme Court reversed the lower courts and dismissed Coquia's complaint, ruling in favor of ACI on three key points.

No Contract of Adhesion

The Court rejected the finding that Purchase Order No. 106211 was a contract of adhesion. Coquia was an experienced businesswoman who had dealings with large corporations and had actively sought ACI's business. She voluntarily negotiated and agreed to the terms. The Court emphasized that courts must be careful before treating a contract as a mere "take it or leave it" arrangement, especially where the parties dealt with each other on relatively equal footing.

Novation by a Later Purchase Order

Under the Civil Code, an obligation is extinguished by a substitute one when the substitution is declared in unequivocal terms, or when the old and new obligations are incompatible on every point. Here, Purchase Order No. 106373 expressly stated it superseded Purchase Order No. 106211. Coquia knew of the new order, delivered under it, and even sent statements reflecting the reduced price. By accepting the new terms without protest, she effectively agreed to the novation.

The Court held that ACI could not be compelled to accept deliveries to complete the original 2,500 to 3,000 metric tons, nor could it be bound to the original P4.20 per kilo price.

The Parol Evidence Rule and Its Exception

The parol evidence rule generally prohibits evidence that would alter or contradict the terms of a written contract. However, the Rules of Court provide an exception: a party may present evidence to modify, explain, or add to the agreement if the pleadings put in issue the failure of the written contract to express the parties' true intent.

ACI had raised this exception in its Answer, arguing that the purchase order failed to reflect that prompt delivery was a condition of the deal. The trial court should have admitted the testimony on this point. The Supreme Court noted that while the trial court was wrong to exclude this evidence, the error did not change the outcome because the second purchase order had already novated the original agreement.

Damages Unsupported

The Court also struck down the award of actual damages. Coquia's claims for lost profits and expenses were based on her own testimony without documentary support—no loan documents, no receipts, no evidence of her alleged stockpile. Damages cannot rest on speculation or bare assertions.

Practical Takeaways

• A later agreement can extinguish an earlier one. If a new purchase order or contract expressly states it supersedes a prior one, the earlier obligation is novated. Parties should read such clauses carefully before signing.
• Silence can mean consent. Accepting deliveries, issuing statements, and receiving payments under a new agreement without protest may be treated as ratification of the new terms.
• The parol evidence rule has limits. Courts may admit evidence outside a written contract when a party pleads that the document failed to express the true agreement. But this exception must be raised in the pleadings, not merely at trial.
• Damages need proof. Actual damages require competent evidence of the loss. Testimony alone, without supporting documents, is usually insufficient.
• Not all form contracts are adhesion contracts. Courts look at the actual bargaining relationship, not just the fact that one party prepared the form.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.