Hi Daniel and welcome to the OpenHAB community!
I believe this is the documentation for the device in question?
link to pdf document
At the bottom of the last page there is a troubleshooting section that does include instructions on how to manually put the device into inclusion mode which is the same as saying ‘wake up’ the device.
Here is a link to a thread I started a while back about OpenHAB friendly motion sensors. In this thread, you can read about my trials and tribulations getting several brands of battery powered motion sensors working. Some needed woken up numerous times. Feel free to add your review of your sensor to the thread after we get it going