It is used to make it known that the contract from which it is derived is the only valid one between the parties and that it includes all the provisions and agreements concluded between them concerning its subject matter. In other words, there are no other previous agreements or treaties that could influence or modify the agreement agreed therein and, where appropriate, should not be considered valid. We would simply like to point out that this is a series of very frequent standard clauses, which are normally found at the end of the Treaty and which are intended to settle a number of usual or standardised issues. Professor Carrasco (Civil Law Lessons). General compulsory and contractual law, Ed Tecnos, p. 150) nuances that “this clause does not allow the possibilities of interpretation of the document to be chosen, so that the conduct of negotiation excluded as an interpretative matter is nevertheless prior acts to be dealt with when interpreting the treaty”. . . .