The following problem in the German localization:

You can generate the VAT report (USt.-VA) as XML, but if you upload this file to Elster, this is refused with the error message “The version 2023 of the transmitted data does not match version 2024 of the form” - although it is of course 2024 data.

Does anyone have any ideas? Ticket at Odoo was (as far as I know) unsuccessful. It's probably a feature, not a bug. I just don't know what for yet...