credit note number and credit note ubl

-- url of the page with the problem -- : www.ubuntushop.biz
-- HikaShop version -- : 6.1.1
-- Joomla version -- : 5.4
-- PHP version -- : 8.4

1) if i create credit note, there is no number of credit note
2) how to create credit note ubl (e-invoicing)