(1) Any amendment to the public procurement contract, other than changes which do not alter the basic nature or scope of the public procurement contract, shall be expressly agreed by the parties in writing.
(2) An amendment to the contract that will increase the public procurement contract value by more than 25% requires the initiation of a new public procurement procedure.
(3) A formal amendment of the public procurement contract is not required where the procuring entity wishes to make a variation or invokes a public procurement contract price adjustment which is expressly authorised in the public procurement contract.