TFC_DB_ITEM_DATA 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 "Data for Items" 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_TFC_DB_ITEM_DATA TYPE TFC_DB_ITEM_DATA.
The TFC_DB_ITEM_DATA table consists of various fields, each holding specific information or linking keys about Data for Items data available in SAP. These include POS (Position under a Node), GRP_PREV (Integer for Fast Close (Node Administration)), KIND (Task Type (Report, Workflow, Transaction, Note)), REPORT (ABAP Program Name)... 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. .