I can believe ! that was the problem...
Well, i note it was the hospital ship after destroy it, looking at the kapitan log (Key K) i had sonar contacts, follow them, when near in the map, i aproach them at my deck gun, when was at about 6000m, i filled it with shells.... and wait for the ship go down, i never take some time to identify it,

, was a big ship in red on the map.... 106000 tons losed

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Thanks for help...