When searching for purchased songs iTunes only offers downloads.

I mean that when I am building a playlist, as I am wont to do, I put my requirements into the search box near the top right hand corner of the application. I am simply searching for a track, oblivious as to where or when I might have acquired it. When I find what I seem to be after and come to drag it into the playlist for assessment, if it is a previous iTunes purchase, a dialogue appears stating "Adding iTunes purchases to playlists will download a copy to your computer." This will happen whether the tune is in my library or not.

Of course I can take the long way round and go to 'Songs' and search in there. Then I will get an indication of the status of the item I am after and I can add it to the playlist. However it is a bit of pain to have to keep doing that.

Thanks - I don't think this a case of library corruption.