Aah - rename in Sonar - of course 
That did it, thanks!
I now have a Analysis Result in SonarCloud.
However, the PR is not annotated. It should be possible to make SonarCloud comment on PRs like for GitHub, right?
I installed the BitBucket SonarCloud addon.
Anything else I have to do?
PS @NicoB My first try to answer lead to my post being flagged as spam. Why?