Identifier of a document that substantiates the invoice (e.g. timesheet, delivery note). Mandatory within group BG-24 whenever an attachment is supplied.
cac:AdditionalDocumentReference/cbc:IDram:ApplicableHeaderTradeAgreement/ram:AdditionalReferencedDocument/ram:IssuerAssignedID (TypeCode 916) Part of BG-24 Additional supporting documents
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Semantics: EN 16931-1. Simplified explanation in our own words — the norm is authoritative.