Steps to reproduce:
1. Make a KDE application crash. For example, launch the Configure Desktop
program and make some changes or just open a non-trivial configuration page
without changing anything, then exit the program.
2. When the Crash Reporting Assistant launches, continue to the possible
duplicates list, select one and open its description. (For the aforementioned
case, the issue number ends in 711 or 771, iirc, - cannot re-check, as my
desktop currently becomes unresponsive during that stage due to some KDE freeze
bug.)
3. Upon seeing relevant reported issue, press the "Suggest this crash is
related", - nothing happens.
4. Return to the duplicates list and press Next. The Assistant will tell you
that you have no duplicate selected.

This is a known issue:
> KDE 354110 - "Suggest this crash is related" does nothing 
It was fixed almost 2 months ago, but still did not get to openSUSE. Please,
update.