User Types 

The SAP system categorizes users into several types for different purposes as shown in the table below:

User Types

Type	Purpose
Dialog	Individual, interactive system access.
System	Background processing and communication within a system (such as RFC users for ALE, Workflow, TMS, and CUA).
Communication	Dialog-free communication for external RFC calls.
Service	Dialog user available to a larger, anonymous group of users.
Reference	General, non-person related users that allows the assignment of additional identical authorizations, such as for Internet users created with transaction SU01. No logon is possible.

 

We recommend assigning the appropriate user type when creating users. For example, if the user does not need dialog access to the SAP System, then define it as a system user. If the user is an anonymous, public user that many different individuals can use, then define it as a service user and keep its authorizations to a minimum.

For more information, see information about the Logon Data Tab Page in the user management documentation.