In the FD form, the Null Value property describes the data value that will produce a null, or will be stored when a null is written, in an SQL column using this data item. The representation of a null for a data item in the FD form is selected from a list of condition-names. The conditional variable associated with a condition-name in the list does not have to be the data item on the FD form for which the Null Value property is being defined. See Defining Null Information.