Hi,
Well you can probably disable or remove the OBS repo, You can cherry pick the packages using
yast2 sw_single
once you have disabled the OBS repo where those packages came from and do a force re-install those packages without the OBS repo.
Scripting zypper might do it also.
First find out the OBS repo.
zypper lr
# | Alias | Name | Enabled | Refresh
---+---------------------------+------------------------------------+---------+--------
1 | Packman | Packman | Yes | No
2 | libdvdcss | libdvdcss | Yes | No
3 | openSUSE-13.2-0 | openSUSE-13.2-0 | Yes | No
4 | repo-debug | openSUSE-13.2-Debug | No | No
5 | repo-debug-update | openSUSE-13.2-Update-Debug | No | No
6 | repo-debug-update-non-oss | openSUSE-13.2-Update-Debug-Non-Oss | No | No
7 | repo-non-oss | openSUSE-13.2-Non-Oss | Yes | No
8 | repo-oss | openSUSE-13.2-Oss | Yes | No
9 | repo-source | openSUSE-13.2-Source | No | No
10 | repo-update | openSUSE-13.2-Update | Yes | No
11 | repo-update-non-oss | openSUSE-13.2-Update-Non-Oss | Yes | No
**12** | shells | shells | Yes | No
The leading number in the repos would suffice in our example.
In this example we will do a vendor change from OBS shell repo to standard openSUSE repo.
List the packages from the shell repo (leading number 12)
zypper --no-refresh se -ir 12 | awk '$1 ~ /^i/{print $3}'
bash
bash-completion
bash-doc
bash-lang
command-not-found
ksh
libreadline6
readline-doc
scout
zsh
Now capture/save that packages in an (bash) array named packages in our example.
mapfile -t packages < <(zypper --no-refresh se -ir 12 | awk '$1 ~ /^i/{print $3}')
Disable that shell repo (leading number 12).
zypper mr -d 12
Do a force reinstall of the packages that came from the OBS shell repo (leading number 12) to the standard openSUSE repo.
zypper in -f "${packages@]}"
This is just a simple case but you might have some more complicated cases that cherry picking packages one-by-one is needed and doing it manually.
Also some folks might have some better ideas. 