Maintenance Status
SAP systems: Control user authorizations with a concept
DDIC: DDIC is the only user able to log in or make changes to the ABAP Dictionary during installations and release changes. It is also used in the client 000, e.g. for certain jobs or Unicode conversions. DDIC exists in all clients except 066. Safeguard measures: In all systems (except for client 000 due to upgrade features), set DDIC to the System user type. If necessary, you can switch it back to a dialogue user using the Emergency User. Change the password, assign the user to the SUPER user group, and log it with the Security Audit Log.
Another important authorization object for background processing is the object S_BTCH_NAM, which allows a user to run the steps of a job under another user (see SM36 -> Edit step). Here, a name other than the user's own can be entered in the user field of a step. The prerequisite is that the job scheduler has an authorization for the object S_BTCH_NAM, which contains the name of the step user, and that the step user exists in the same client as the job scheduler itself. From 4.6C: The step user must be of type Dialog, Service, System or Communication.
Note the maintenance status of permissions in roles and their impact
You can still assign roles and profiles to a user if you have the appropriate permissions to these activities. As long as no user group is associated with the user, permissions for any user group will be sufficient. If you assign a user group to the newly created user, all the checks will be repeated for that user group.
Assigning a role for a limited period of time is done in seconds with "Shortcut for SAP systems" and allows you to quickly continue your go-live.
The website "www.sap-corner.de" offers a lot of useful information about SAP authorizations.
For even more extensive operations on jobs, there must be an authorization for object S_BTCH_ADM, in which the field BTCADMIN (identifier for the batch administrator) has the value 'Y'.