SAP USER MASTER RECORD GLOSRY documentation, setup help and example usage

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User Master Record
A user master record must exist before a user can log on to an AS ABAP . The record determines which actions a user of a certain user name is allowed to execute and which authorizations he or she possesses. Default settings, such as the way in which decimal separators are displayed in lists , are still recorded in the user master record. User master records are edited in user maintenance (
transaction code SU01 ).
ABAP_MORE_INFO