IManagementDatabaseTableRow.ParentRowGuid Property
Parent rows are used to create a structured hierarchy of data. For example, let's have a parent table Companies whose rows are companies. This table has a child table called ContactPersons. The ContactPersons contains rows with person names and each row points to a row in the parent Companies table to define to which company the person belongs. Multiple rows in a child table can point to the same parent row.
All of this has meaning only in custom tables, not in the estimate table. The main estimate table has no parent table. In this case, this property contains null reference (Nothing in Visual Basic).
Available since QDV 7.14.520.