E2CHARF 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 "References from Charact. to Fields in my SAP ER Tables" 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_E2CHARF TYPE E2CHARF.
The E2CHARF table consists of various fields, each holding specific information or linking keys about References from Charact. to Fields in my SAP ER Tables data available in SAP. These include CHARID (Internal counter for objects in an SCE knowledge base), TABLENAME (Table name), FIELDNAME (Field 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. .