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   One of the fundamental properties of a lookup relation is the possibility
   to have more than one field of a source file inherit values stored in the
   lookup file. Inherited fields are those fields that inherit values from a
   field of another file. As a default dBsee offers, as the only inherited
   field, the relational field in common to both the parent file and child
   file. It is possible to add new inherited fields, even if they come from
   files other than the parent file, delete such fields or modify an existing
   expression.

   The Inherit button, placed on the definition frame, allows for the
   definition of the inherited fields, and of which expression those fields
   should inherit. The button displays a list of fields from the parent file
   that inherit data. The left column displays the field; the right column
   displays the expression that is inherited.