EPM System can be deployed to support SSO with SAP Enterprise Portal where users who are defined in an SAP native repository are permitted to navigate between the SAP Portal and EPM System products by accepting an SAP logon ticket. In this scenario, EPM System treats SAP Enterprise Portal like a application. If SAP BW or R/3 native repository is configured as an external directory in Shared Services, users can log in to EPM System products using the user ID and password stored in the SAP system.