On a 32 bit system:

If you install OpenSUSE with the xen pattern, when the system comes up, the grub boot menu has two xen entries. One of them is valid (xen.gz), while the other is not (xen-pae.gz). There is not /boot/xen-pae.gz. I believe the first option is selected by default, but if the user selects the second option, the system will not boot.

On a 64 bit system:

If you install OpenSUSE with the xen pattern, when the system comes up, the grub boot menu has two xen entries. They both work, as they are the same, just one points to the sym-link, while the other points to the versioned kernel file. But why two entries?

It is my understanding that with code 11, all xen pae kernels and hypervisors are now just "xen", instead of "xenpae" or "xen-pae". Fixing this to only create one xen boot entry would be nice to avoid any confusion.