I have created a system "System Administration->System Configuration->System Landscape" to connect to a ECC 5.00 System. The connection is ok. I gave Enduser rights to the system for the group of user that should use it.
As an Administrator I can map a user account of the ERP system to the one of the portal user. But the user himself using the Link "Personalize->User Profile->User Mapping for System Access" does not see the system.
What permission, roles etc. are needed to get the system visible for a user.