You should have access to the project.
For more information, see Setting Access Control for Business Rules Project
In the Rules Manager view, from the project table, choose the required project.
Choose the Open Project button.
Select one of the options mentioned below.
Active Version - if you want to work with an active version in the Rules Engine.
Latest Version - if you want to work with the latest changes made to the project.
Note
If you want to toggle between the active and latest versions of a specific project, choose the Change Project button.