I was (and will after I post) installing openSUSE 13.1 guest on Ubuntu 13.10 host. I chose to use Easy Install to test but something similar happens using 'I will install the operating system later" (i.e. WS sees the disk mounted on sr0 as openSUSE but uses Windows 7 as the default name for the OS (I did not previously install Windows 7 BTW).
You can see what happens by viewing the screenshots below. Although easy enough to correct it is a bug (I reproduced it at will after canceling the installation).