User Management Data Repositories 
The user management component uses two data repositories to store user-related data. These are:
Both directories are based on the Lightweight Directory Access Protocol (LDAP).
For information on which directory servers the Enterprise Portal supports, see the Platform Availability Matrix on the SAP Service Marketplace.
Corporate LDAP Directory
The corporate LDAP directory is a central repository of user data. The portal can be configured to authenticate users logging onto the portal against the corporate LDAP or against an external user repository. In either case, the authenticated user must have an account in the corporate directory.
If the schema of your corporate LDAP directory uses different attribute names to the user management API, you must map the attribute names in your schema to the attribute names used in the user management API. See
Mapping Attributes. The schemata supported by the Enterprise Portal are described in Organization of Users and Groups in Corporate Directory. Any other schemata are supported on a project basis.
Portal LDAP Directory
The user management component also uses a dedicated directory, called the portal LDAP directory, that stores user data required by the portal only. These are
This data can either be stored in separate branches on the corporate LDAP directory server, or on a dedicated LDAP directory server.
The Enterprise Portal provides tools to populate this directory, for example, the user mapping and role assignment tools.
In addition, the user management API provides methods to read and write to both the portal and corporate LDAP directory. This allows you to write your own iViews that use this data. For information on the user management API, read the Portal Development Kit (PDK) documentation available on the iViewStudio at www.iviewstudio.com.