You want to add a field type CURR to a transparent table. What else must you do?

To successfully add a field of type CURR to a transparent table in the context of ABAP programming and SAP database design, it's essential to establish a reference to a field of type CUKY. This is crucial because the CURR type, which represents currency amounts, relies on a currency key to define the currency context in which the amount is expressed.

The field of type CUKY functions as the currency key that determines the currency used for the amounts held in the CURR field. By creating this reference, you establish a linkage between the currency and its corresponding amount, ensuring that any data integrity and validation related to currency handling can be enforced.

The option involving adding a check table that contains a field of type CUKY, while relevant for data integrity, does not directly establish the necessary linkage for a CURR field. Similarly, adding a key field or creating a new field of type CUKY may also be beneficial for other design purposes but doesn’t specifically address the requirement of ensuring that every amount stored in the CURR field is appropriately tied to its currency type. Thus, establishing a reference to an existing CUKY field effectively meets the requirement for adding a CURR field in a transparent table.