IBCUST_SCREEN_FIELDS 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 "IB: Structure with Fields for Dynpros of Func. Module 0IIB" 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_IBCUST_SCREEN_FIELDS TYPE IBCUST_SCREEN_FIELDS.
The IBCUST_SCREEN_FIELDS table consists of various fields, each holding specific information or linking keys about IB: Structure with Fields for Dynpros of Func. Module 0IIB data available in SAP. These include TREE_FIELD_DESCR (Explanatory 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. .