The description for the value to be used, if the column has foreign key relation but its value is NULL.
There are several ways in which you can specify the description.
For detailed information on the mechanism see Caption The extended properties of the database relation object are used.
The description extended property is "SDBF_NULLValueDescription".
The description resource id extended property is "SDBF_NULLValueDescriptionResID".
The auto generated resource id has the following form - {FKRelationName}.NULLValueDescription, where FKRelationName is the database name of the relation.
FieldSchema Class | Adillis.SmartDBForms Namespace | FKInfo