suggestion

Les modules ne peuvent pas être modifiés lorsqu'ils font partie d'une "library" (librarie). Le fait de transformer un "library module" (module de librairie) en "user module" (module utilisateur) permet de le modifier.

3.4.4 Claiming Modules

(Click to Enlarge)

Figure 3.9: Claiming Modules
Sometimes you may wish to modify a module that is part of a library. But since modules that are part of a library can not be modified, you must "claim" that module before you can make any changes. Claiming the module make that module part of your design, rather than part of the library. This allows you to edit and make changes to the module. When you save your design, your version of the module will be saved.
Since modules that are defined in your design take precedence over library modules, the next time you load your design, the claimed module will continue to be used in lieu of the library version of that module. If you later decide that you would like to revert to the library version, you can delete the module, and reload the library.

To claim a module, right click on the module to be copied from the module list and select " Claim". This will bring up a dialog box like the one shown in Figure 3.9. Make sure the "Name" field shows the name of the module you wish to claim. The symbol next to the module will change to or to indicate that that module is now part of your design.

Only modules that are part of a library can be claimed. If you attempt to open the claim dialog box when there are no library modules in your circuit, you will get an error message.