The modern concept of treaty is generalized, so that an agreement does not have to correspond to a certain type to be applied, but the parties are obliged to conduct their relationship in good faith (Bona Fides). A legal instrument that incorrectly registers the contract between two parties can be corrected to meet the common intent. In this case, there is an ad idem consensus; It is not the treaty itself that is rectified as a legal act (negotium), but the instrument in question (instrumentum), because it does not embody what the parties intended to do as the content of their agreement. A power condition depends on one of the Contracting Parties for its performance; it is entirely in power of one of the parties. For example, Zola agreed to give a sum of money to her neighbor Jaylynne if Jaylynne would cut down a tree that was hindering her vision. If Jaylynne agrees to cut down the tree for the money, the deal does not come with any conditions: Jaylynne is required to fulfill her side of the bargain. A purely potestative condition if volam, which provides or not to the promiser an unlimited choice on performance – “I give you R100 if I wish” – clearly does not create any obligation, but the situation is different if the fulfillment depends on the will of the promise (where Andrew Bianca, for example, gives an option to buy his farm). A state of power can be negative, like when Andrew Bianca makes a gift, provided Bianca does nothing. A promise subject to a condition of negative power is only achievable with the death of the promise, for only then will the condition be fulfilled. Although there is no paper record justifying an oral contract, oral agreements are as binding as written and signed contracts. The subject matter of the contract is included in the terms of an agreement. These conditions define and qualify the obligations that a contract creates.  It should be noted that the rule does not apply to oral agreements entered into after the completion of the written document.
Therefore, proof may be provided of a subsequent oral agreement that modifies or abandons the written agreement, unless the contract is prescribed by law, since such a contract cannot be modified by a subsequent oral agreement, although it may be annulled by such an agreement. Similarly, an oral amendment is non-compliant if the treaty itself provides that it can only be amended in writing, and it therefore appears that it is an oral agreement to terminate the contract. But at the end of the day, having a legitimate oral agreement can be two completely different things and being able to prove that you have entered into a legitimate oral agreement. Some agreements require the development and signing of written agreements or contracts, for example.B. marriage contracts, the sale of real estate and wills, to name a few. Delegation or intercession is a form of novation in which, with the agreement of all the parties concerned, a person outside the initial contract is entrusted with the responsibility for the performance of the service agreed therein. Three parties deal with this act: for example, a developer assigns an agent to find him a designer for a golf course he wants to build, but does not give a specific time to accomplish this task; it is an open agreement….