Creating Transient Attributes
A transient attribute is a placeholder for a data value. If you change the Updatable property of the transient attribute to While New or Always, the end user can enter a value for the attribute. If you want the transient attribute to display a calculated value, leave the Updatable property set to Never and write custom Java code that calculates the value.
You can define the transient attribute either at the entity object level or at the view object level for view-specific transient attributes.