COMS_ALTID_CNFLD_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 "Context Data for ID Types (Key Fields)" 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_COMS_ALTID_CNFLD_KEY TYPE COMS_ALTID_CNFLD_KEY.
The COMS_ALTID_CNFLD_KEY table consists of various fields, each holding specific information or linking keys about Context Data for ID Types (Key Fields) data available in SAP. These include ID_TYPE (ID Type for Alternative IDs), CONTEXT_FIELD (Context Field Name for Alternative IDs)... 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. .