CKI_TCKM2E 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 "Currencies of the Material Ledger" 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_CKI_TCKM2E TYPE CKI_TCKM2E.
The CKI_TCKM2E table consists of various fields, each holding specific information or linking keys about Currencies of the Material Ledger data available in SAP. These include MANDTE (Client), BWKEYE (Valuation Area), LFDNRE (Consecutive number for additional ML types - no longer used), MATLEDE (Material Ledger Type)... 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. .