New historical investment

But if you go via expenses, click on depreciations (left side module) and then via "new historical depreciation". Then you won't get that blockage of the financial year, will you?

Dear, I only have the option 2023 - 2024 - 2025

But you can enter that the depreciation started in 2020 and the number of years over which you are depreciating? Then enter the remaining amount to be depreciated in the 2023 financial year (I suspect that the previous years are already included elsewhere) and then I think that should be okay.