I have tested it now with the dome and mount in reallity and tried the calibration procedure for the slaving paramters for the dome.
When i only move the DEC axis of the mount it is working correct, but when i bring the DEC back to 90° and then move only the RA axis it is not moving correct.
When i slew the RA axis to the east side the dome first moves to the east side then it slew to the mirrored side (log file). This happens every time.

When North = 0°, West= 90° and East 270° --> DEC is working
When North = 0°, West= 270° and East 90° --> AR is working

Where can this come from?

When someone need more informations do not hesitate to contact me.

Thanks for your replies.