ICH_DM_REF_STR 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 "Details of References to a Business Object" 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_ICH_DM_REF_STR TYPE ICH_DM_REF_STR.
The ICH_DM_REF_STR table consists of various fields, each holding specific information or linking keys about Details of References to a Business Object data available in SAP. These include ITEM_ID (ID of Reference Document Item), TYPE (Reference Document Category)... 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. .