What should not exceed one in the RPG creation process?

In the RPG (Resource Planning Group) creation process, the top-level hierarchy should not exceed one because it represents the highest level of organization within the project structure. This hierarchy sets the fundamental framework for how all sub-levels and components of the project relate to each other. Having only one top-level hierarchy ensures that there is a clear and unified structure, which simplifies management and navigation throughout the project lifecycle.

A single top-level hierarchy facilitates accountability and responsibility, allowing team members and stakeholders to easily understand the overall organization of resources and activities. When there is a single point of reference at the top level, it helps prevent confusion and maintains consistency across project documentation and reporting.

In contrast, elements like project level, permission control, and region setup can have multiple instances or configurations based on the requirements of the project. These components are designed to be flexible and accommodate various needs, whereas the top-level hierarchy serves as a foundational anchor for the entire RPG framework.