CA 2E lets you specify only virtual fields on the Owned by, Refers to, and Extended by relation types. Virtual fields can be used only as read-only fields in standard functions. This read-only field is implemented as a join logical file or SQL view. It checks on the generation mode and access path type.
Different access paths for a file can contain different combinations of relations, and each file-to-file relation on the access path can have a different set of virtual fields associated with it.
For more information about files and relations, see the chapters "Understanding Your Data Model" and "Creating/Defining Your Data Model" in Defining a Data Model.
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