Rules not working on inherited properties

[WouterThys]

When setting rules for properties which are defined in an abstract parent class, they are not applied to the base class..

AbstractBaseObject is defined as

public abstract class AbstractBaseObject 
{
    protected long id;
    protected string code;

    public long Id 
    {
        get => id;
        set => id = value;
    }

    public string Code 
    {
        get => code ?? "";
        set => code = value;
    }

}