Portal - BO SSO


We want to set-up SSO between SAP EP and Business Object to allow users to access reports without having to sign-on again. There is a lot of documentation explaining how to set-up SSO by putting in place SSO between BO and BI or ECC but what if the user does not exist in the SAP system...

In our case, EP and BO are connected to Active Directory where the user is created but the user is not created in any SAP system. How can we set-up SSO between the portal and BO in that case?

Thank you very much for your help!