Your comments

Hi Michel,

You are right !

there is still no official Amazon image, we are currently working on
this subject and this should happen soon on GLPI Network.

Stay tuned \O

The correct menu is "Setup > Checks".

Example : Serial unicity on Computers.

GLPI already has a mechanism to control the unicity of objects (menu Configuration > Unicity).

You can add rules to block object creations according to the desired criteria, and you can directly see also in this rule (tab "Duplicates"), objects that are already duplicates.

Since you don't have a unicity rule yet (otherwise you wouldn't have duplicates ^^), to fix them you can use the "uninstall" plugin ( and its "replace" model.