COMT_IL_FIELDNAME_TYPE 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 "Field-Name Data-Element Pairs for Differentiation Key" 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_IL_FIELDNAME_TYPE TYPE COMT_IL_FIELDNAME_TYPE.
The COMT_IL_FIELDNAME_TYPE table consists of various fields, each holding specific information or linking keys about Field-Name Data-Element Pairs for Differentiation Key data available in SAP. These include DATAELEMENT (Data element (semantic domain) of field), HIDDEN_LIST (Do Not Display Field in List), HIDDEN_DETAIL (Do Not Display Field in List), FIELDTYPE (Defines which kind of field we see on screen)... 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. .