A project profile is necessary to create a work breakdown structure.

The project profile contains default values and parameters for managing your project, for example, the settlement profile, the factory calendar for scheduling, or settings for graphics.

You can maintain the values for the project profile in Customizing for the Project System.

When you create a work breakdown structure, you must enter a project profile the project definition. You can change default values from the project profile when you are working in the work breakdown structure.