Calculate (sum) two entities to one sensor

Aaah that is the issue, great! Everything is working now, amazing! Thanks!

I just have an additional question regarding entities;

When I added the meter in the config.yaml file, a lot of entities were added in the list but as you can see in the config.yaml file there are only 5 entities listed. All the extra entities are also not working (no value showing). How and why are those extra entities in the list and are they not working because it is not supported?

Thanks anyway!