Not able to select correct SMA solar item for energy screen

I’m trying to setup my Energy Tab.
When I want to add my solar power to that screen (I have an SMA Sunny boy that is working) :
Now, I want to add this to my energy screen but the only option I have is ‘pv_gen_meter’
I tried it this way, but then it gives me the wrong value for that hour :
Is this normal, can I choose another value somehow?
Or does it take some time to show the correct values ?