Comment # 1 on bug 1133423 from Antoine POULAT

Note: I made a workaround adding a pre-install script that, for my example file
attached, does this:

#!/bin/sh

ZYPP_LOCKFILE_ROOT="/var/run/autoyast"

declare -A priorityMap
priorityMap[Skype]=20
priorityMap[packman-essentials]=10

for key in "${!priorityMap[@]}"
do
    sudo zypper mr -r -p ${priorityMap[$key]} "${key}"
done

In addition, I've just seen I made a typo on how I checked the repos priority,
it is actually "zypper lr -p" (not "-lr").