Is there a solution to this? I do have “Generate invoice numbers” (Rechnungsnummern erzeugen) activated, but on the invoice is the order number printed (Bestellnummer).
Just changing the string wp-content/plugins/woocommerce-delivery-notes/languages/woocommerce-delivery-notes-de_DE.po from Bestelldatum to Rechnungsdatum doesn’t change anything.