EXPD_TRACK_ITEM 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 "Identification Data in Progress Tracking" 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_EXPD_TRACK_ITEM TYPE EXPD_TRACK_ITEM.
The EXPD_TRACK_ITEM table consists of various fields, each holding specific information or linking keys about Identification Data in Progress Tracking data available in SAP. These include EBELP (Item Number of Purchasing Document), ETENR (Delivery Schedule Line Number), RSNUM (Number of Reservation/Dependent Requirement), RSPOS (Item Number of Reservation/Dependent Requirement)... 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. .