Please enter the name, address and national identity number (11 digits) of the person who is sending the deed for registration. If the sender is a company, please write the organization number. The sender will receive the registered document and invoice for registration fees and possibly stamp duty. Letter If you enclose a letter, the person who has signed the letter will be considered the sender, even if another person or company is listed as the sender on the actual deed.  Reference number A reference number is optional, but if you would like the invoice to be identified with a reference number please inform us of your chosen reference in this field.