Whether the document implies the integration of the agreement depends on the intention of the parties to be its exclusive registration. Extrinsic evidence is excluded because it concerns issues that have become legally insignificant or irrelevant due to the reduction of the contract to writing and its integration into a single monument. In case of application of the iustus error method, In the event that there is an alleged agreement between the parties, the Holocaust denier bears proof that his error is both substantial and proportionate to be exempted from liability within the meaning of the apparent contract: to Teekay Tankers against STX Offshore & Shipbuilding  EWHC 253 (Comm), the High Court considered whether an option agreement on tanker construction was void for reasons of uncertainty. The Commercial Court responded to the applicant`s assertion that the parties intended to conclude a binding contract and was therefore endeavouring to implement the option agreement. It stated, inter alia, that the option agreement was part of a `package` of contracts and that the consideration for the grant of the options by the defendant was also taken into account by the subsidiaries of the applicant which concluded the shipbuilding contracts. The applicant, an oil tanker operator, concluded an option agreement with the defendant, a shipyard. The agreement granted the applicant three options, each concerning an order for four oil tankers. It provided that, in exercising an option, the delivery dates between the parties were “mutually agreed”, but the defendant “will do its best to have a delivery” in 2016 for Option 1 tankers and in 2017 for Option 2 and 3 tankers. It also provided that the parties would enter into shipbuilding contracts within ten days of the exercise of an option. The parties and their subsidiaries have also entered into other agreements, including four shipbuilding contracts, each ordering an oil tanker. Simply put, a contract is an agreement between two or more parties with the serious aim of creating a legal obligation. Treaties are indispensable for settling certain relationships, as they provide security on what the parties expect from one another. Contracts provide a legal framework governing the relationship between the parties and providing certainty that the law respects their agreements and implements them if necessary.
It can therefore be said that treaties contribute to order in society. When the parties conclude a contract, commitments are made. An obligation to that effect is a legal relationship consisting of a right of performance of the counterparty, accompanied by an obligation to perform the “end of the transaction”. In order to minimise this risk, where flexibility is necessary and no significant time limit can be set at the time of conclusion of the contract, the parties should provide for provisions that operate late in the agreement between the parties. . . .