Switzerland (YellowBill): Additional Document Reference IDAn identifier for the referenced document.For yellowbill CH invoices, in case the ID of the attached document is not available, use NA. This element is syntactically required. Element PathUsageInvoice/AdditionalDocumentReference[boolean(Attachment)]/IDMUpdated 8 days ago Switzerland (YellowBill): Additional Account ID Scheme IdentifierSwitzerland (YellowBill): Additional Party CodeDid this page help you?YesNoElement