/ubl:Invoice/cac:AdditionalDocumentReference

VRBL-Invoice-IS-PeppolBIS-3p0 - Additional Document Reference Group

Iceland | VRBL-Invoice-IS-PeppolBIS-3p0

Context ID	INV0213
Usage	O*

Description

A group of business terms providing information about additional supporting documents or referenced documents substantiating the claims made in the Invoice.

The additional supporting documents can be used for both referencing a document number which is expected to be known by the receiver, an external document (referenced by a URL) or as an embedded document, Base64 encoded (such as a time report or the PDF version of the invoice).

Child elements

Usage	Element	Description	Cardinality
M	`cbc:ID`	Additional Document Reference ID An identifier for the referenced document.	1..1
O	`cbc:DocumentDescription`	Additional Document Reference Document Description Text describing the referenced document.	0..n

Details

vrbl-invoice-en16931-ubl-model

In the context of EN16931 it can be used to cover following business terms:

Invoiced object identifier (BT-18)
Additional Supporting Documents (BG-24)

Example: IS_creditnote_381.xml

<ubl:Invoice>
  <!-- ... omitted for readability -->
  <cac:AdditionalDocumentReference>
    <cbc:ID>2026-07-20</cbc:ID>
    <cbc:DocumentDescription>EINDAGI</cbc:DocumentDescription>
  </cac:AdditionalDocumentReference>
  <!-- ... omitted for readability -->
</ubl:Invoice>

Rules

Rule ID	Error Message
VRBL-INV-IS-1p0-8	When the Seller Country Code is 'IS' and the Additional Document Reference Document Description is 'EINDAGI', the corresponding Additional Document Reference ID MUST be in the format 'YYYY-MM-DD'.
VRBL-INV-IS-1p0-9	When the Seller Country Code is 'IS' and the Additional Document Reference Document Description is 'EINDAGI', the Payment Due Date should be provided.
VRBL-INV-IS-1p0-10	When the Seller Country Code is 'IS' and the Additional Document Reference Document Description is 'EINDAGI', if both Payment Due Date and cbc:ID used as EINDAGI are given then the cbc:ID used as EINDAGI must be later or equal to the Payment Due Date.
VRBL-INV-EN16931-M-6	The Additional Document Reference ID must be provided in the Additional Document Reference Group.
VRBL-INV-CORE-85	The Additional Document Reference Group expects a maximum of one Additional Document Reference Document Type.
VRBL-INV-CORE-86	The Additional Document Reference Group expects a maximum of one Additional Document Reference Document Description.