COMT_LH_DIFF_KEY_DEF_KEY 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 "Key Structure for Default Values During Generation" 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_COMT_LH_DIFF_KEY_DEF_KEY TYPE COMT_LH_DIFF_KEY_DEF_KEY.
The COMT_LH_DIFF_KEY_DEF_KEY table consists of various fields, each holding specific information or linking keys about Key Structure for Default Values During Generation data available in SAP. These include OBJECT_TYPE (Object Type of a Set 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. .