Hi again,
I'm now sure that was the problem. The latest issue I was having (and for which I was not sure if I gave you the right info) was that the application was not appearing in the cockpit right after activating the files. The problem is that I forgot to recreate the .xsapp file (which is empty).
Anyway in the 10 points defined by the "Creating an SAP HANA XS Application", you didn't do the 5° correctly. Check it.
Ciao