A meter relevant to billing is offline and thus stops the calculation. Try to bring the meter back online so that the calculation can continue.
A meter was billed above or below 100% (e.g.: The general meter is divided among the billing units on a percentage basis and also 100% in the general folder, so it is billed at 200%).
Not all necessary meters were assigned to the solar or battery tariff during tariff configuration.
The calculation of the billing has not yet been completed and the bill has already been generated. The "last calculated values" must show the current date.
The configuration was changed (e.g. folder structure, tariffs, etc.) and "recalculate" was not clicked.
The conditions of the tariffs overlap (i.e. are active at the same time) and the system does not know which tariff it should now assign the values to.
The tariffs do not cover the entire period and there is energy that cannot be allocated to any tariff. This usually happens when there is no normal tariff without a condition.