RDUNN_HIST_EXT 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 "Work Area for Dunning History in Loans Management" 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_RDUNN_HIST_EXT TYPE RDUNN_HIST_EXT.
The RDUNN_HIST_EXT table consists of various fields, each holding specific information or linking keys about Work Area for Dunning History in Loans Management data available in SAP. These include BUKRS (Company Code), SARCHIV (Archiving Category Indicator), RANL (Contract Number), MABER (Dunning Area)... 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. .