Entire Agreement Clauses, Broker Instructions and Pleadings: The Limits of Amendment Applications

A recent decision of the Gauteng Division of the High Court, Johannesburg, in United Minerals and Energy (Pty) Ltd v Willis South Africa (Pty) Ltd (Case No. 2025-111954), provides useful guidance on the distinction between contractual terms and instructions given pursuant to a contract.

The judgment arose in the context of an application to amend particulars of claim under Rule 28. In refusing the proposed amendment, the Court emphasised that a party cannot simply characterise a contractual relationship as "partly oral and partly written" where the written agreement contains an entire agreement clause, without explaining how those allegations can coexist.

The decision will be of particular interest to insurers, brokers, and commercial litigants. It highlights the limits of Rule 28 amendments, the importance of coherent pleadings and the care required when seeking to rely on oral communications alongside written contractual documents.

What happened?

The plaintiff instituted action arising from the repudiation of a marine insurance claim.

Its primary claim was directed against the insurer under the policy. In the alternative, it pursued its insurance broker, Willis South Africa (Pty) Ltd, alleging that the broker had failed either to secure appropriate cover or to advise the plaintiff that the relevant cover was not in place.

The plaintiff's claim against the broker was advanced in contract and, alternatively, in delict.

The broker challenged the pleadings through procedural mechanisms directed at the adequacy of the plaintiff's case. Following those challenges, the plaintiff sought leave to amend its particulars of claim.

The proposed amendment was intended to reformulate the contractual basis of the plaintiff's claim by alleging that the mandate between the parties was partly written and partly oral.

The proposed mandate

The plaintiff relied on the broker's General Terms of Business Agreement as the written component of the alleged mandate.

It alleged that verbal instructions provided to the broker constituted the oral component of the agreement.
The difficulty with that formulation was that the written agreement contained an entire agreement clause. The agreement expressly recorded that it constituted the entire agreement between the parties and provided that amendments required the broker's written consent.

The broker objected to the amendment on the basis that the proposed pleading was contradictory and excipiable. It contended that the plaintiff sought simultaneously to rely on a written agreement containing an entire agreement clause and on additional oral contractual terms without explaining how the two positions could be reconciled.

The broker therefore argued that the proposed amendment would leave the particulars of claim vulnerable to exception and should be refused.

The distinction between a contract and instructions

The Court accepted that the written agreement contemplated that clients could communicate instructions to the broker orally or in writing.

However, the Court emphasised the distinction between:

• instructions given pursuant to an existing contract; and
• oral contractual terms said to form part of the contract itself.

According to the Court, the written agreement created the mandate relationship and established the framework within which instructions could be communicated and implemented.

The fact that instructions could be given orally did not mean that those instructions automatically became oral contractual terms forming part of the agreement itself.

The plaintiff was therefore entitled to plead the instructions it had given to the broker and to rely on those instructions as part of its case. What it could not do was characterise the mandate itself as partly oral and partly written without explaining how that allegation could be reconciled with the entire agreement clause.

The Court found that the proposed amendment blurred the distinction between the agreement creating the mandate and the instructions allegedly provided under that mandate.

Why the amendment failed

The Court concluded that the proposed amendment would create uncertainty regarding the case the broker was required to meet.

It was unclear whether the plaintiff relied upon:

• the written agreement alone;
• additional oral contractual terms; or
• a combination of the two.

As a result, the broker would not be able to plead meaningfully to the proposed allegations.

The Court held that the proposed amendment would leave the pleading contradictory and excipiable. In those circumstances, it applied the established principle that an amendment should not be permitted where it would render the pleading excipiable.

The objection therefore succeeded.

The result

The plaintiff's application for leave to amend was dismissed.

The Court ordered the plaintiff to pay the broker's costs, including counsel's fees on Scale B.

Comment

The judgment provides useful guidance on the distinction between oral contractual terms and oral instructions communicated pursuant to a contract.

In commercial and insurance disputes, parties frequently seek to rely on oral discussions, requests, instructions, and exchanges that occur during the course of a contractual relationship. This judgment serves as a reminder that those concepts are not necessarily interchangeable.

While a contract may contemplate instructions being provided orally or in writing, it does not follow that those instructions become contractual terms forming part of the agreement itself.

Where a written agreement contains an entire agreement clause, parties should carefully distinguish between:

• the contract itself;
• communications made in performance of the contract; and
• separate oral contractual undertakings.

Failing to maintain that distinction may leave a pleading vulnerable to objection.

For brokers and professional advisers, the judgment highlights the importance of clear engagement terms and carefully drafted entire agreement clauses. For litigants, it underscores the need to ensure that pleadings align with the contractual documents upon which they are founded.

The lesson is straightforward: where a written agreement contains an entire agreement clause, a party cannot simply describe the relationship as "partly oral and partly written" without explaining how those allegations coexist. If it fails to do so, a proposed amendment may be refused before it ever reaches trial.