Switzerland (YellowBill): Contract Document Reference IDYou can provide the contract documentation reference ID in your invoices.The identification of a contract. Elements PathUsageFinal Format XPathInvoice/ContractDocumentReference/IDM/Envelope/Body/Invoice/Header/ContractReference/ReferenceValueUpdated 9 days ago Switzerland (YellowBill): Buyer Tax Scheme IdentifierSwitzerland (YellowBill): Customization IDDid this page help you?YesNoElements