Si por error no se pueden asociar elementos en el plugin de Servicios ITIL de GLPI, hay que corregir la PRIMARY KEY de esta tabla :
ALTER TABLE glpi_plugin_services_services_items MODIFY COLUMN id INT AUTO_INCREMENT; mysql> DESC glpi_plugin_services_services_items ; +-----------------------------+--------------+------+-----+---------+----------------+ | FIELD | TYPE | NULL | KEY | DEFAULT | Extra | +-----------------------------+--------------+------+-----+---------+----------------+ | id | INT(11) | NO | PRI | NULL | AUTO_INCREMENT | | plugin_services_services_id | INT(11) | NO | MUL | 0 | | | items_id | INT(11) | NO | MUL | 0 | | | itemtype | VARCHAR(100) | NO | MUL | NULL | | +-----------------------------+--------------+------+-----+---------+----------------+ 4 ROWS IN SET (0.00 sec)