OWL CM160 : New batteries on Sensor, how to correct values ?

[Jeremob]

Hello guys,

I'm using couter powermeter OWL CM160 since few years, working well

But Today, I decide to change batteries, too low
Not a big deal to do that, and to replace old device by the new detected device, to merge datas ...

But the problem is : the CM160 with new batteries transmit a value from 0, incremented by the consumed power
The old device has incremented is value up to 15.000kwh when the new device start from 0 ...

So, the data merge is impossible as you can see in screenshot
For the moment I have old device, and new device

So, 2 questions are there :
I cannot remove the wrong value "-15.575" (shift + clic) from the old device, nothing happen ...
- Is there a way to remove this wrong value ?

When its done, is this possible to have a workaround to merge data correctly with the new device who started from 0 ?

Or the only way is to have old (for history) and new device ?

Thanks a lot guys !