RDUNN_EXCEPTION 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 "Contracts that are not dunned" 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_EXCEPTION TYPE RDUNN_EXCEPTION.
The RDUNN_EXCEPTION table consists of various fields, each holding specific information or linking keys about Contracts that are not dunned data available in SAP. These include RANL (Contract Number), DUNN_IT (Option Whether Object is Dunned)... 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. .