A User Group's default Document Type Privileges are determined by the settings under User Groups & Rights | Privileges. You can override these default privileges for any of the User Groups you added in the User Group Assignment dialog box.
A user may be a member of two or more User Groups that have conflicting override privileges. When this occurs, you can specify whether to use the least or most restrictive effect over privileges. For more information on least restrictive and most restrictive override options, see Security Tab.
When a user is a member of two or more User Groups, but override privileges are only configured for one of the User Groups, the most restrictive override privileges are used. For example, if a user is a member of a User Group named MANAGER that is not configured for any override privileges and a User Group named USERS that is configured for override privileges, any conflicting privileges between the MANAGER User Group and the USERS User Group will be given to the user based on what is configured for the USERS User Group. If the MANAGER User Group is configured to allow document deletion, but the USERS User Group is not configured to allow document deletion, the user will not be allowed to delete documents.
To set override privileges during Document Type configuration: