To allow automatic data filtering by an identifier whose description is (usually) assigned to another related attribute.
For the dynamic combo box and dynamic list box, it allows specification - in design time- of the attribute that will be considered in runtime.
In this structure:
The AirlineId attribute can be set as a Dynamic Combo Box in order for the ItemDescriptions and ItemValues properties to be shown. If you want the values of the AirlineName attribute to be shown in the field, assign the AirlineId attribute to the ItemValues property, and the AirlineName to the ItemDescriptions property.
Objects: Transactions, Web Panels
Controls: Dynamics Combo Boxes, Dynamics List Boxes
Languages: .NET, Java, Ruby