The “Fakturierende” is a TB.One flag used for OTTO. It is used to show that an article is no longer active. As long as the articles are active, the 19.01.2038 is sent as Fakturierende (invoicing end date). If an article is deactivated, the current date is sent as the "Fakturierende". This means that if the article is deactivated today, today’s date is sent as "Fakturierende".