Service cross references defines the related services between the service giving company (the handling company) and the related company (can be airport authority, external service provider etc.).
On the above image, a sample of the related services between the handling company and the airport authority company can be seen.
When a service references another service, it means that, during the price calculations of that service, the referred service is also priced to be invoiced along with the original service. The extra commissions and royalty fees that arise as a result of a given service can be defined as referred services at this screen.