DATEV - first day of fiscal year

Hello, in the exported DATEV file the first day of the fiscal year is set as 01.01.YYYY where YYYY is the fiscal year, always January first indipentently of the real date of the fiscal year. Our fiscal year starts on July 1st and end on June 30th, so I would expect to have a starting date 01.07.2021 for FY 2022 and not 01.01.2022. The FY is correctly set up in General Ledger --> set of books and assigned companies. There I can see the right starting date of the fiscal year.