CSS_USR is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "CSS User File" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_CSS_USR TYPE CSS_USR.
The CSS_USR table consists of various fields, each holding specific information or linking keys about CSS User File data available in SAP. These include ADRNR (Address), NATIO (International address version ID), ANRED (Title), ABTEI (Addresses: Department)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .