Component of a structure, database table, or view of the type CUKY defined in ABAP Dictionary. A currency key can be associated with a currency field of a structure, database table, or view. The currency key contains a currency ID from the database table TCURC, and defines the currency for the currency field. By default, the number of decimal places for a currency is always two. Currencies with a different number of decimal places must also be entered in the table TCURX, where the number of decimal places can be defined explicitly.