Yes, that solves the problem! Thanks for your example.
It is not sufficient to define a "Class_Initialize" in the base class or to leav out the default constructor at all.
You have to define your own default constructor. Otherwise Jabaco does not allow you to define constructors of derived classes.
But it is still not possible to call the constructor of a base class.
In your example, you circumvented this limitation by a simple "Base.MyInt = 456".
But for more complex base constructors it would be nice to write "super(456)".
Greetings
A1880