According to the below statements, only the below address fields are mandatory for tax invoices however on the sandbox system we receive an error message when field Building/House Number - HOUSE_NUM1 in empty, so should this field be populated?
As per the Electronic Invoice XML Implementation, role (BR-KSA-10) Buyer address must contain a street (BT-50), city (BT-52), postal code (BT-53), country code (BT55).
This rule does not apply on the simplified tax invoices and associated credit notes and debit notes (KSA-2, position 1 and 2 =02).