added iphone into my profile while i have ipod, shows same apple id
I have my first ipod, and added into my apple profile, Then I bought iphone 5s. in my iphone profile, my ipod have been listed, when I added my iphone 5s, it cant work. It shows that my appled id same with my ipod. so it need new apple id. Is it right or one device must have one apple id (can't combine)?
iPhone 5s, iOS 7.1.2