Sensor type “energy” is used for DPT 14.031 with unit Joule.
Looking at your current value I guess this is not the correct DPT. See KNX - Home Assistant
hm this seems ok. Maybe the recorder / long term history thing has some wrong information from the earlier config. I don’t know how to reset this though.
I looked at another device which is showing up in the dropdown menu.
It had some additional parameters/attributes which I provided via customize.yaml to the sensor in question as well: