Original sentence: "Ashhadu ana Alian waliullah" ("I bear witness that Ali is the vice regent of God") is not a part of adhan and iqamah.If you add it when you are performing adzan, you are a "musyrik"
Edited sentence: According to Shi'a scholars, Ashhadu ana Alian waliullah ("I bear witness that Ali is the vice regent of God") is not a part of adhan and iqamah but it is recommended (Mustahabb) to say that twice after third part of the adhan which is "Ash-hadu anna Muhammadar-rasūl ullāh"