MAM_30_DEFAULT_OPERATION_UNIT 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 "Default Values of Units in Operations" 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_MAM_30_DEFAULT_OPERATION_UNIT TYPE MAM_30_DEFAULT_OPERATION_UNIT.
The MAM_30_DEFAULT_OPERATION_UNIT table consists of various fields, each holding specific information or linking keys about Default Values of Units in Operations data available in SAP. These include DURATION_UNIT (Normal duration/unit), WORK_UNIT (Unit for work)... 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. .