When you first create a business application in Splunk AppDynamics, the Default Scope ensures that all tiers for the application have a default automatic discovery rule for every agent type. Because the scope configuration model is highly configurable, the Controller UI enforces validations in the following cases:

• When you change the automatic discovery rules for a scope.
• When you assign or reassign tiers to a scope.

When you attempt to make an invalid change, the Controller prevents the change and displays a message in the Controller UI.

These validations ensure that after configuration updates every tier in your business application has the default automatic discovery rule for its agent type. They also ensure that there is an automatic discovery rule for all agent types to handle any prospective tiers you add to your application.