I tried it – and it works for me.
Thank you very much for your help!
Disabling the “Enable” entry helps to work around the problem.
I now have to define my autorec rules a little more carefully – as far as possible.
This is because the rule specifications “star treck” and “science fiction” lead to one entry in the list of upcoming recordings.
If I now deactivate the one entry in the list of upcoming recordings (...and it was entered based on the “Star Trek” rule), it will be re-entered during the next EPG run based on the “science fiction” rule.
But I can live with that – it works for me.