Validation or Firewall Rules are put in place by Tradeshift and your customer to ensure all documents can be processed in a timely fashion once they are received by Levi Strauss.  Should your invoice be non-compliant with the validation rules you will receive information as to what needs to be changed for it to be accepted.  By ensuring we only accept compliant invoices, we make the payment process as smooth as possible for us and for you.