The second appellant and the first respondent concluded a written agreement of sale on 9 April 2002 for immovable property, subject to suspensive conditions, including rezoning approval within 12 months. The rezoning condition was not fulfilled timeously and the agreement lapsed automatically. In August 2003, through correspondence between their attorneys (letters B1 and C1), the parties purported to revive the lapsed agreement with an amendment to the rezoning condition, allegedly deferring compliance until transfer. The appellants sought to enforce transfer of the property or interdict its transfer to third parties. The first respondent excepted to the particulars of claim, arguing that the alleged revival constituted a new sale agreement that did not comply with s 2(1) of the Alienation of Land Act 68 of 1981, and alternatively that no waiver was possible because the agreement had lapsed.