In an ABAP Core Data services (CDS) view, what must you do to expose an association for use in another CDS view?

To effectively expose an association for use in another CDS view, it is essential to focus on including all fields that are part of the ON condition in the projection list of the CDS view. This is critical because the ON condition determines how the association between the entities is established, and having those corresponding fields included ensures that the associated data can be accurately pulled and related when the association is utilized in another view.

By including these fields in the projection list, you facilitate the precise linking of data between the views, allowing consumers of the CDS view to leverage the association seamlessly. This practice enhances data integrity and usability, making it easier for consumers to query based on the relations defined.

The other choices focus on different aspects of defining CDS views or associations but do not directly address the fundamental requirement for exposing an association correctly. For example, defining cardinality helps in understanding the nature of the relationship, while specifying aliases can aid in referencing, but it is the inclusion of the fields in the projection list that directly makes the association functional for use in other views.