Using Caché Objects - InterSystems Documentation

Using Callback Methods
20.10 %OnRollBack
This instance method is called by the %Save method if an object cannot be saved. This
method holds code that performs rollback-related actions on objects other than the one being
rolled back. At the time when this method is invoked, the state of the object may be inconsistent
with other objects; you can use %OnRollBack to correct this condition.
Its syntax is:
ReturnValue %OnRollBack()
where:
ReturnValue
A %Status code, where an error stops the rollback operation.
This method is available to the %Library.Persistent class and its subclasses.
20.11 %OnValidateObject
This instance method is called by the %ValidateObject method just after all validation has
occurred. This allows you to perform content-dependent validation, such as where valid values
for one property vary according to the value of another property.
Its syntax is:
ReturnValue %OnValidateObject()
where:
ReturnValue
A %Status code, where an error causes the validation to fail.
This method is available to the %Library.RegisteredObject class and its subclasses.
176 Using Caché Objects