ASH_TABFIELDS 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 "Info Structure Field Check" 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_ASH_TABFIELDS TYPE ASH_TABFIELDS.
The ASH_TABFIELDS table consists of various fields, each holding specific information or linking keys about Info Structure Field Check data available in SAP. These include REFFIELD (Reference field for archive info. structure)... 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. .