You have created custom ODATA service for Installed Base. You want to include the Location information and other fields like Latitude and Longitude, however you are not able to find the same.
Currently these fields are not available in the consumers of the Business Object like Web Services, ODATA services.
Further the Installed Base Object is also not avilable in the stanard ODATA service.
This is expected system behavior. This functionality is added as a new requirement and will be available in one of the future releases.
KBA , AP-IBA-IBA , Installed Base , How To