If the type of a derived is a peanut class, it is called a . PntDerivedPropertyDescriptor implements property for relationships.
In many cases the value of a derived property will be derived by a getter method on the peanut's class. Such a method may for example calculate a total or multiply some other property values.
If a derived property has a field, it is only used for caching and should never be accessed directly.
Derived properties are readOnly by default, but can be defined as not readOnly.