Q: This message prompts up again and again!

i had an iPhone ano an iPad. I used two different apple IDs to sign up. But when I updated both my divices to iOS8 I signed both devices with the same ID.   On my iPad Whenever I go to Settings>iTunes and app store>automatic downloads and switch on music and bbooks and also when I go to music library and download the free album of U2 which is already downloaded on my other device, this message pops up!

here are the pictures: https://www.dropbox.com/sh/ubhmypuq2sd598c/AACRU5d2TaEwN5J-4K64uOTDa?dl=0