63. A supplement to a supply, construction or professional services contract in a case referred to in paragraph 1 of section 62 or a supplement attributable to a variation in a period determined in a contract where the remuneration is established on the basis of a rate must be authorized by the Chief Electoral Officer in the following cases:(1) where the initial amount of the contract is less than $100,000 and the supplement or the total of the supplements exceeds 25% of the amount of the contract; or
(2) where the initial amount of the contract is $100,000 or more and the supplement or the total of the supplements exceeds $25,000 or 10% of the amount of the contract, whichever is greater.