MHND_GROUP 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 "Dunning Data Grouped in Groups" 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_MHND_GROUP TYPE MHND_GROUP.
The MHND_GROUP table consists of various fields, each holding specific information or linking keys about Dunning Data Grouped in Groups data available in SAP. These include MANDT (Client), LAUFD (Date on Which the Program Is to Be Run), LAUFI (Additional Identification), KOART (Account Type)... 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. .