A functionality can be achieved either by an application or application system, or at a conceptual level, by a logical application or application system.
To associate an application with a functionality, you must create a functionality realization.

A realization describes the relationship between a logical entity and a physical entity that implements it. The physical entity gives the list of logical entities that it implements.
To specify that a functionality is implemented by an application:
1. Open the Implementation property page of the functionality that interests you.
2. Click New.
The creation window for a functionality realization opens.
3. Select Reusing an existing....
4. Select the Application object type.
5. Select the application that interests you and click OK.
The functionality realization appears in the list with the name of the selected application.
HOPEX IT Architecture provides reports to display realization coverage of functionalities by operational elements such as logical or physical application components: