In the market, the philosophies underlying the conclusion of a single agreement can be: be expressed as (i) as a desire to jointly develop a redefined area of units and to participate together in the goods and misfortunes of this area, as if the participants were all partners in a single license, or (ii) the desire to “do to Caesar what Caesar is” and to ensure that the share of each hydrocarbon group in hydrocarbons represents the hydrocarbons that are originally present in their own field of licensing. There is no homogeneous UUOA because (i) distinguishes the characteristics of a specific interterritorial reservoir (for example. B, oil or gas, reservoir properties, large or small or different, on both sides of the border); (ii) the country in which the inter-territorial reservoir is located (or country in the case of a cross-border unit); and (iii) the context in which the transterritorial reservoir is developed (for example. B for the export of LNG in the case of the Bayu-Undan cross-border unit). While the AIPN Unit Agreement is extremely useful and relevant to serve as the basis for the negotiation of an OAU, it is often the case that parties will have to modify, supplement, reject or replace certain provisions of the AIPN model unit agreement in order to achieve their commercial and/or legal objectives. The purpose of the unit agreement is to create the single unit in the two or more licensing or contract areas that contain the reservoir, by combining the respective interests of the licensees and providing the development, operation and closure of the unit. The normally operational sections of the Unity Agreement create unity, expose their effects on participating interests and avoid certain legal pitfalls for the unwary. First, the agreement provides that all parties have agreed to unite their interests, so that in the future the parties will be treated as if they had signed a lease agreement covering the entire area subject to the unit. A second provision generally endeavours to adapt all existing leases and other instruments to the terms of the single agreement, subject to the authorisation of the competent authority, and a specific language allowing the production at the unit to extend the production period of a concession may also be included. As a general rule, this section contains a provision that expresses the parties` intention not to give interests wrong; This is the case with the many problems with the treatment of unitary interests, such as authorizations. B, preferential purchase rights and tax issues.