Yast -Create virtual machine GUI problem

I wanted to create a new virtual machine (xen) using yast as done on another machine before…
But here I can change any setting because when clicking on the ok/apply button for the new setting I only receive an error message that my setup is wrong.
From this message I assume that yast interprets the klick as "install now " and not “apply settings”, because then the message is actually right…

Is this an known issue anything I can do? (already attempted yast update, but no help…)

What kernel do you have installed? You need the xen kernel

Xen Kernel is installed ->
I also believe it is more an GUI issue than a xen issue.
Therefore I will attempt to achieve this without the yast gui, even though it would be nice to know what is wrong here.