Hi all,
It was indeed that a few components were missing. At first I wasn't having the slightest idea of what I really needed, but your hints and blogs helped me to understand little by little.
It was intended to be used WebDynpro ABAP components on a Java Portal. At the moment I understand that it is different if one uses WD Abap instead of WD Java and vice-versa (at the start I was reaaaaally confused about it all).
So after the components were installed, I just remade the backend roles, adjusted the backend configuration to remove the task association (which would have been correct with WD Java), confirmed in the portal that the SWF_WIOBN.NAVIGATE pointed to the powl iView and voilá... everything worked perfectly (it's a kind of magic).
Again, thank you all for your hints, because they helped me understand it all better and fix it.
Kind Regards,
Paulo