In ABAP Objects, when a subclass constructor is implemented, it must adhere to specific rules related to the inheritance chain. Firstly, the subclass constructor must explicitly call the constructor of its direct superclass using super->constructor. This call is mandatory and must be the first action that affects the instance; no instance components (attributes or methods accessed via the me reference) can be used before this call. This ensures the inherited part of the object is properly initialized. Secondly, the signature of the subclass constructor is independent of the superclass's constructor. This allows the subclass to define its own specific parameters required for its instantiation, which can then be used to provide the necessary values to the superclass constructor.

B. Import parameters must be evaluated before calling the superclass constructor, as their values are often required to be passed to the super->constructor call.

D. Raising an event is an action on an instance. Like accessing any other instance component, it is forbidden before the super->constructor call has completed and fully initialized the object.

1. SAP Help Portal - ABAP Keyword Documentation - CONSTRUCTOR:

Section: Instance Constructor: "In a subclass

the instance constructor must explicitly call the instance constructor of the direct superclass using the pseudo reference super->constructor

before it can access the components of its own class. ... Before the superclass constructor is called

no components of the instance can be accessed using the self-reference me." This directly supports option C and explains why D is incorrect.

Section: Instance Constructor: "The interface of the instance constructor of the subclass can be defined in any way

as long as it provides the parameters of the superclass constructor with values." This directly supports option A.

Section: Instance Constructor: "The public and protected parameters of the superclass constructor's interface are filled in the statement super->constructor." This implies that the values must be ready before the call

which contradicts option B.