ATPSDU 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 "ATP: Scheduling durations" 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_ATPSDU TYPE ATPSDU.
The ATPSDU table consists of various fields, each holding specific information or linking keys about ATP: Scheduling durations data available in SAP. These include TRANSPDISP (Duration for scheduling (gross OR net)), TRANSPDISP_FC (Factory calendar key), TRANSPDISP_TS (Working time from sales view), TRANSPDISP_TZ (Time Zone)... 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. .