The appellant (seller) and first respondent (buyer) entered into a written agreement of sale on 25 January 2006 for property known as 139 Rietfontein, Harare, for a purchase price of Z$28 billion. The agreement contained an entire agreement clause (clause 11) stating that the written document constituted the entire agreement and no variations would be binding unless reduced to writing and signed by both parties. The agreement was signed at CABS offices, which immediately instructed attorneys to attend to bond registration and transfer. On 30 January 2006, the appellant wrote to CABS and the respondent purporting to cancel the agreement without citing any breach. The respondent refused to accept the cancellation and obtained a provisional order in the High Court restraining the appellant from disposing of the property and requiring her to show cause why transfer should not be compelled. The appellant opposed confirmation, claiming there was an oral condition precedent that the respondent (who was Deputy Minister of Industry and International Trade) would provide her with two licences (for sugar and petroleum trading), and that the low purchase price reflected this arrangement. The appellant's friend and confidante, Biata Nyamupinga, who was actively involved in negotiations, denied any discussion of such licences.
The appeal was dismissed with costs. The order of the High Court confirming the provisional order compelling transfer of the property to the respondent was upheld.
The parol evidence rule prevents a party to an integrated written contract from adducing extrinsic evidence to contradict, alter, add to or vary the written terms where the purpose is to redefine the contract and enforce it as redefined. While extrinsic evidence may be admitted to show that a contract is conditional upon an event that has not occurred, such evidence is inadmissible where its object is to incorporate an alleged oral condition into a written agreement containing an entire agreement clause and then to enforce that condition. The integration rule protects the integrity of written contracts and prevents parties from unilaterally altering the recorded terms of their agreement through the introduction of extrinsic evidence.
The Court observed that even if parol evidence had been admissible in principle, the evidence on the record did not support the appellant's case. The Court noted various factors undermining the credibility of the alleged oral agreement: (1) the appellant's confidante who participated in negotiations denied any discussion of the licences; (2) neither of the two licences allegedly offered fell within the respondent's ministerial mandate; (3) no explanation was given for why the appellant signed the agreement if the condition precedent remained unfulfilled; and (4) when the appellant purported to cancel the agreement, she gave no reason for the cancellation and cited no breach, which would be inconsistent with her later claim that the respondent had breached an oral condition precedent.
This case is significant in Zimbabwean (and by extension South African) contract law for its clear application of the parol evidence rule and the integration principle in the context of written agreements containing entire agreement clauses. It reinforces the principle that parties cannot use extrinsic evidence to vary, add to, or contradict the terms of an integrated written contract, particularly where an entire agreement clause exists. The case provides important guidance on when extrinsic evidence of alleged oral conditions precedent will be excluded, specifically where the purpose is not merely to show that a contract is conditional, but to redefine its terms and enforce the redefined version. It emphasizes the sanctity of written contracts and the protection of parties' reasonable expectations when they have reduced their agreement to writing with clear integration clauses.