Oh sorry, I certainly misunderstood then; it’s was reading this:
« 2. In NEW_LINES.dat, click on the menu item Tools and select Remap Id's.... Click on Random to create a random key, and click on OK. Now, all the nodes have been remapped. »
Readed too fast
I'm going to correct to make even clearer : "Now, all the IDs in NEW_LINES.dat have been remapped."