SAP SLD or SAP System Landscape Directory is the central component used to register and hold information about the systems in the SAP landscape. Metadata of systems in the landscape and their software components are stored in SAP SLD. For more information, see the SAP PI/PO Server documentation.

When you register Integration Server instance in the SAP SLD, the SAP_XIAdapterEngine object represents the Integration Server instance. When you create a service-endpoint association, XI Adapter creates a corresponding SAP_XIAdapterService object in the SAP SLD. XI Adapter associates the SAP_XIAdapterService object with the SAP_XIAdapterEngine object. Before you can unregister Integration Server instance in the SAP SLD, you must delete all service-endpoint associations so XI Adapter will delete the corresponding SAP_XIAdapterService objects in the SAP SLD.