The main contracts and security contracts are active simultaneously and, in some cases, the provisions of these contracts may replace the provisions of the former. For example, companies X and Y enter into a construction contract with X as the owner and Y as the owner. It then enters into a secondary contract with Z, a hardware supplier. If the materials are found to be defective, X Z can sue when they do not have a contract between them. Accompanying 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.  In the English case Barry v Davies, it was found that an auctioneer and a buyer had entered into a secondary contract.  It has been found that, although the main contract does not concern the incense, the benefits granted to the bid represent a good consideration for the increase in the price of the offer.  There is an interesting situation where the contracting parties execute one contract and then execute another contract on the same subject. The question then arises as to which contract governs the relations between the parties.
To answer this question, we have to look at the terms of each treaty. If the terms of the new contract are so inconsistent with the terms of the original contract that both parties must consider that the original contract no longer binds them, the Tribunal may be willing to submit an exemption from the obligations under the new contract under the original contract. In Morris v Baron and Co  AC 1, Morris agreed Baron and Company 500 pieces of Blue Serge on terms stipulated in the written contract (so that the written requirements of Section 4 of the Property Act 1893 (UK)) gave rise to difficulties, the parties pursued each other and eventually their actions were compromised by a verbal agreement, according to which Baron-Company should already obtain compensation for defective deliveries, it should be free to accept other deliveries at their discretion and pay the corresponding amounts. Before the House of Lords, the question was whether one of the agreements was applicable: Graw S, An Introduction to the Law of Contract (1998), 3rd Ed, Lawbook Company Information Services, North Ryde, 322 – 323. With a two-part security contract, the two parties that enter into the main contract also enter into the security contract. A tripartite support contract includes a debt statement of a third party that does not participate in the original contract. This. B is often used in the case of a sales contract.
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.