Is Arabic required?
Tax invoices may be issued in Arabic, in English or in both. The authority can request an Arabic translation of documents it reviews, which is a practical reason to have key fields in Arabic already. Some government buyers and semi-government entities write Arabic into their procurement terms, so read the purchase order before you send the first invoice.
The required particulars are the same whatever the language: the "Tax Invoice" heading, both TRNs, a sequential number, dates, line details, the VAT amount in AED and the total.