Problem is solved!
1. Use only the protocols you need. Don't enable all
2. Use the latest EXT2 firmware.

After that the sensor is detected as X10 security and can be used in Domoticz.

Lightning4 is also enabled.
Without any result

I have bought the same sensor but cannot detect the sensor with Domoticz
- X10 is enabled
- device detection is enabled
- Sensor is on and blinking
- latest 1022 firmware used for RFXcom
- latest 3.8153 Domoticz used

Please can you tell me how you add the sensor to Domoticz? Doing something special?