Cloud services interwork with each other. Therefore, the administrator needs to assign both the required roles and their dependent roles for the authorization to take effect. Policies, however, do not require dependencies.
next to the role to view the dependencies.For example, the DNS Administrator role contains the Depends parameter which specifies the dependency roles. When you assign the DNS Administrator role to a user group, you also need to assign the Tenant Guest and VPC Administrator roles to the group for the same project.