SACD Iso Sources are not imported into the Music Library

I have a dedicated SACD Iso Share on my NAS which i added as a media source to the Music Library. 

I can acess the Iso Files in this Source through Music/Files and play them but the Media insite the SACD iso Source is not imported into the Music Library, Scraper finds nothing (Scrapers are used with the same settings that work perfectly well on my Music Share with flacs and mp3´s).
