DATA_REOM_CST 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 "Data Transfer Within Function Group REOM" 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_DATA_REOM_CST TYPE DATA_REOM_CST.
The DATA_REOM_CST table consists of various fields, each holding specific information or linking keys about Data Transfer Within Function Group REOM data available in SAP. These include MANDT (Client), LEDNR (Ledger for Controlling objects), OBJNR (Object number), GJAHR (Fiscal Year)... 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. .