Hi Josh,
thanks for your help.
I think that you are right: we have to test-systems, one with already RU13 installed and one with RU12.
I thought that both were on RU13 but tested real against RU12.
I have now installed the test-plugin on the crm with RU13 and there it seems to work fine.
So it seems that rollup 13 solved this issue.
Thanks for your help
Karl