The entries of a file arise from three different levels at which you specify relations for the file:
File level—all those fields resulting from the resolution of file relations.
Access path level—all those fields resulting from the resolution of access path relations. They must be either inclusive of or be a subset of the entries from the file relations level.
Device file level—those fields resulting from the resolution of device file relations. Entries resolved at this level are a subset of the access path level entries, which may not include every relation of the file.
You can add additional entries to device designs for function fields.
