User Types in SAP

Five Type of users in SAP,  they are

1. Dialog User
2. System User
3. Communication User
4. Service User
5. Reference User

1. Dialog users:

Dialog users are interactive users, this is used to logon SAP System using the SAP GUI. While logon system checks user password has expired or initial, so user can update his password. 

2. System Users: 

It is used to communicate within the system. The system user can not login to SAP GUI and it wont check password details, so only admin can change the password. For example internal RFC Users.

3.Communication Users:

These are non-interactive users. This users used for background processing & communicate between systems. GUI logon not permitted for this type of users. Their passwords are valid for a certain period & it will expire. The users have the option to change their passwords.

4. Service Users: 

This type of users are available to a group of users access. The system doesn’t check the details of password and only admin can change the password. Normally highly restricted authorizations are given to this type of user.

5. Reference users: 

This type of users used for authorization of administration. You are not allowed for login to SAP System with the reference user type.

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