Assume Orders and Customers are in different services and have cross-service navigation properties to each other:
Now a new version v2 of the Customer service is published.
Ideally the Order service now automatically navigates to the new (latest) Customer service without requiring a new version of the Order service, and in addition allows navigation to the old version:
GET Orders(4711)/Customer -> navigates to Customer v2
GET Orders(4711)/Customer;v1 -> navigates to Customer v1