I have an opensuse Leap 42.2 system upgraded from Leap 42.1. There's no owncloud Leap 42.2 repo, just Leap 42.1 and Tumbleweed.
Is there a reason for this / problem with recent versions of owncloud on Leap 42.2?
It seems that there are no official but there are plenty of people that have packaged ownCloud.I suggest you should try the latest versions.
There are Leap 42.2 as well as 42.3 repositories available here:
https://download.owncloud.org/download/repositories/stable/owncloud/ (currently provides 9.1)https://download.owncloud.org/download/repositories/10.0/owncloud/https://download.owncloud.org/download/repositories/9.1/owncloud/
which are the official ones.
The pages in openSUSE haven't been updated, nor have the new repos been added there, and the SDB ownCloud page is out of date.
I think those pages are out of the control of the ownCloud community. Maybe you can try some one of opensuse to get those updated.
The SDB page is updated now.