COMS_ALTID_CONTEXT_EXT 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 Information for Alternative IDs" 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_CONTEXT_EXT TYPE COMS_ALTID_CONTEXT_EXT.
The COMS_ALTID_CONTEXT_EXT table consists of various fields, each holding specific information or linking keys about Context Information for Alternative IDs data available in SAP. These include FIELDVALUE_CHAR (Context Fields with Data Type String)... 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. .