COMS_ALTID_OBJ 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 "Object Types for Alternative ID Types" 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_OBJ TYPE COMS_ALTID_OBJ.
The COMS_ALTID_OBJ table consists of various fields, each holding specific information or linking keys about Object Types for Alternative ID Types data available in SAP. These include OBJECT_TYPE (Object Type 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. .