Comment # 3 on bug 1017486 from Bernhard Wiedemann

I think, one thing that bothered me in the first place
is that it did not allow me the option to
keep package X at the current version

so that I have to
1) exit zypper
2) run zypper addlock X
3) rerun zypper dup --no-allow-vendor-change
4) answer questions again