FMDT_COMPARE_VALUES 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 "Structure used in Derivation Tool to compare any field" 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_FMDT_COMPARE_VALUES TYPE FMDT_COMPARE_VALUES.
The FMDT_COMPARE_VALUES table consists of various fields, each holding specific information or linking keys about Structure used in Derivation Tool to compare any field data available in SAP. These include GENERIC2 (Text field length 200)... 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. .