Consider De Lassalle v. Guildford, a loan contract case in which the latter part rented a house at the first. The landlord promised to repair the runoff before the tenant moved in. This promise was considered by the court to be a secondary contract that allowed the tenant to sue if he found that the exits had not been fixed as promised. The rules of proof of the watchword do not apply to ancillary contracts, but only to primary contracts. It can also be illustrated as follows: A support contract is a contract that encourages a person to enter into a separate “primary” contract. For example, if X agrees to purchase Y products manufactured by Z accordingly, based on Z`s assurance of the high quality of the goods, X and Z may consider that X and Z have entered into a guarantee agreement consisting of Z`s promise of quality made taking into account X`s promise to enter into the main contract with Y. This rule prevents parties from changing the importance of written contracts with oral or tacit agreements that are not included in the original contract, the latter impairing their integrity. This means that, when a contract is available in writing, subsequent agreements that are not entered into in writing are not proven in a contractual dispute.
There are, however, several exceptions to this rule. A contracting party may attempt to demonstrate the existence of a security contract if its right to the infringement is denied because the statement on which they were based is not considered to be the duration of the principal contract. It was decided that the explanation must have been so successful.  In the event of a breach of a security contract, corrective action may be taken. The ancillary contracts are independent oral contracts, concluded between two parties to a separate agreement or between one of the original parties and a third party. Read 3 min A support contract, if it is falsified between the same parties as the main contract, must not be contrary to the main contract. In other words, if the term was agreed before the formal contract was concluded (but was still in place and could not be executed before the end of the second term), the first term will remain eligible.  In essence, security contracts cannot contradict an element of the main contract or the rights that flow from it.  Ancillary contracts are an exception to the practice of contractual doctrine, which states that a contract cannot impose obligations or rights on a party not related to the contract.
 However, in cases where a security contract is entered into between a third party and one of the contracting parties, the Court may authorize rights or obligations to the non-contracting party, as outlined in the previous unauthorized Donoghue/Stevenson case.  Most security contracts are one-sided, which means only one party, in exchange for money. B, makes a promise (for example, the provision of a product or service). The agreement with the original contract is the consideration for the security contract. A support contract is usually a one-time contract which, taking into account the party whose benefit is exploited by the contract, enters into the main or principal contract, which sets additional conditions for the same purpose as the main contract.  For example, an ancillary contract is entered into when one party pays the other party a certain amount for entry into another contract.