Service Processes with Installed Bases as Reference Objects 
The subject matter to which the specified subject refers is defined in the service process by entering a reference object. You can specify one or more installed bases or installed base components as reference objects.
You can create service processes for individual installed base components of different types and also for entire installed bases. For example, the service process can refer to a specific model of printer (component type Product), a particular printer (component type Object) or even a complete network (component type Installed Base).
Process
When processing service processes, the Reference Objects assignment block is available for entering installed bases or installed base components.
Enter the relevant ID in the Installed Base or Component field and confirm your entry.
If you have made the settings in Customizing for the business transaction, the system checks to see whether the installed base component is assigned to a service contract, that is, whether the business transaction is covered by a service contract. The following checks are triggered:
Is there a service contract for this component?
Is there a service contract for a higher-level component?
Is there a service contract for the installed base to which this component is assigned?
Is there a service contract for a component product?
If more than one service contract is found for the installed base components, a dialog box is displayed where you can select the service contract and transfer it to the business transaction. Otherwise the transfer is performed automatically according to Customizing for contract determination.
You can see a list of the business transactions that are assigned to a component in installed base management.