[opensuse-autoinstall] specifying addon_product URL

Hi, following situation: we need to mount an isoimage from a USB device during installation. Following media URL is working for us: <![CDATA[iso:/?iso=SLES11-SP1-Updates-PROD.iso&url=hd:///products/isos/?device=/dev/sda1]]> Unfortunately this method relies on device names like sda. In rare situations we need to plug two usb devices into the server. At this point sda would change to sdb. We are searching a solution where we can specify the LABEL of the ISO image like described at opensuse.org/linuxrc install=hd:/?device=*label/foo we tried following URL: <![CDATA[iso:/?iso=SLES11-SP2-Updates-PROD.iso&url=hd:/products/isos/?device=*label/DTM2]]> blkid shows the right Label. But that didn't work. Does anybody know how to specify the URL such we can mount an ISO via Label? Thanks, Jochen