cac:AdditionalDocumentReference
BEAst: Used for additional BEAst information on header level. Peppol:
- Namespace
 cacurn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2- Child elements
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Card Name Description 1..1 cbc:ID Document identifier
BEAst: The reference number of the added information. Can be the Project Number (T6004), Customers' Reference (T6005), Seller's Order Number (T6099), Final Customer's Order Number (T6221), Drawing Number (T6222), Delivery Part (T6340), Freight Payer's Customer Number (T6463) or Document Name (T6484) depending on DocumentType. Peppol: An identifier for the referenced document.Example value:
76487790..1 cbc:DocumentType Document description
BEAst: The type of reference when a valid code is not possible to use. "FreightPayersCustomerNumber" (T6463), "SellersOrderNumber" (T6099), "FinalCustomersOrderNumber" (T6221), "DeliveryPart" (T6340) or Any other document type (T6473). Peppol: Textual description of the document.Example value:
FreightPayersCustomerNumber0..1 cac:Attachment Attachment(s)
 - Rules
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Identifier/Error message Flag PEPPOL-T16-B01001 
Element 'cbc:ID' MUST be provided.fatal PEPPOL-T16-B01002 
Document MUST NOT contain elements not part of the data model.fatal