Energie Costs not valid

Tried to setup the Energy settings. Pricing is 0,355 €/kwh.
First problem, i have no option to get the valid data from the electricity meter, maybe late in some time.
i just want to track and calculate the solar panel, but just adding the solar panel has no option to calculate the price, so i need to setup a dummy to have a fixed price. Don´t know how to do this.

So i tried to do a workaraound, i was setting up power network with the same switch_0 Energy from my shelly to be able to set the pricing. but if i add now the same switch_0 Energy to the solar settings, the energy is duplicated in the view, because both values are added and one of them needs to be inverted, so i added the same switch to the area Back to Network to get the first area to Zero. Looks crazy, but is working. Now i found, that the calculation is not working as expected. Something is adding wrong, as the value is calculated wrong.

I had already values from the solar panel and i don´t want to start again from zero, how can i fix this issue?