Hi Wreford-Brown !
Thank you very much for your instructive reply. The problem didn't come from the ID, because the game didn't crash before my modifications with Wings 3D. But you gave me an idea... There was maybe several objects with the same ID or something like that... I opened Wings 3D and imported the Hood's 3D model. By selecting the whole object, I've noticed that the 2 additional anchors were not selected. So, I combined them to the ship ! And it works !
Combiner ancres Hood.JPG
PS : I have deleted one anchor, because I've realized that Hood had only one anchor on the left.