Description
The problem
I can not save a deriviative without supplying a matric prefix. I have a deriviative I have set up years ago, and it works perfectly. However, I would like to adjust the time window from 30 minutes to 20 minutes. But I can not do this, since it forces me to set a matric prefix. But it is just a percentage (%) that I am getting the deriviative from (%/hour), so it is not even relevant! This means that I cannot save/updat the deriviative at all.
I assume some field which should have been optional is flagged as required.
I hope this bug report can have it fixed, I unfortunately would not know how to do that myself as I keep failing to setup my own Home Assistant development environment.
What version of Home Assistant Core has the issue?
core-2025.2.2
What was the last working version of Home Assistant Core?
No response
What type of installation are you running?
Home Assistant OS
Integration causing the issue
Derivative
Link to integration documentation on our website
https://www.home-assistant.io/integrations/derivative
Diagnostics information
No response
Example YAML snippet
Anything in the logs that might be useful for us?
Additional information
No response