Great, thank you. I was quite busy so I'm late.
But still. I got what you say and it makes sense to me but as I said. There was no restriction on that flight. Definitely not that much. I remember that because we would have to leave all cargo on ground and it did not happen. They had about 110 tons in wings and about 25 tons in CWT. And engineering confirmed that there is no restriction and it is just "info".
And as I wrote it I got it now...maybe.
Short flight but I need fuel in center tank to feed engines. So I must reduce MZFW to counterbalance.
Long flight. My case. No problem because wings are full and other fuel in center tank so the aircraft is loaded and stressed normaly.