I've already reported to the opensuse-factory mailing list that the
factory-repo-checker complains about libreadline conflicts and blocks my parted
requests this way.

The problem is that openSUSE:Factory pulls in obsolete libreadline5 while all
tools using readline-devel pull in libreadline7 additionally. readline5-devel
conflicts with readline7-doc.

See:
https://build.opensuse.org/request/show/491642
https://lists.opensuse.org/opensuse-factory/2017-05/msg00014.html

osc meta prjconf openSUSE:Factory | less
...
    145 Prefer: libreadline5
...

This line has to be removed or changed to libreadline7.

Bug ID	1037212
Summary	openSUSE:Factory pulls in obsolete libreadline5 and blocks all tools using readline
Classification	openSUSE
Product	openSUSE Tumbleweed
Version	Current
Hardware	Other
OS	Other
Status	NEW
Severity	Critical
Priority	P5 - None
Component	Basesystem
Assignee	bnc-team-screening@forge.provo.novell.com
Reporter	sebastian.parschauer@suse.com
QA Contact	qa-bugs@suse.de
Found By	---
Blocker	---