BAPI_SC_ITEM_D 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 "Interface Item Data (BUS2121-Create)" 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_BAPI_SC_ITEM_D TYPE BAPI_SC_ITEM_D.
The BAPI_SC_ITEM_D table consists of various fields, each holding specific information or linking keys about Interface Item Data (BUS2121-Create) data available in SAP. These include ITEM_NUMBER (Item Number), ITM_TYPE (Item Category), PARENT (Parent GUID (Mapping of Outlines)), DESCRIPTION (Short Text)... 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. .