What Is a Landmark Service?
A component of the Lawson system that requires authentication has a service associated with it. Among other things, the service stores specifications about how a user can access that service. When a user attempts to launch the component, the component's service authenticates the user behind the scenes. If the user's identity is assigned to the service (or to a referenced service), the user can use the service without having to log in again.
In general, a service must exist before users can start working with the product or component that the service represents.
Some services are delivered and installed by Lawson. You may need to create or configure others as described by your Lawson documentation for the particular Lawson product.