Component of a structure defined in the ABAP Dictionary or a database table of type CUKY. A currency key can be linked to a currency field of a structure or database table. The currency key can contain a currency code from the TCURC database table and use it to define 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 be entered additionally into table TCURX, where the number of decimal places can be defined explicitly.