Use the AdditionalDocumentReference element and its sub-elements and attributes to attached Base 64 encoded Documents. For example, if you want to reference a human readable PDF version of the Document.

Italian Specification

Detail	Value
Italian Specification	`2.5 (Allegati)`

Elements

Element	Description
`Invoice/AdditionalDocumentReference/ID`	Specify an ID for the attachment.
`Invoice/AdditionalDocumentReference/DocumentDescription`	Specify a description.
`Invoice/AdditionalDocumentReference/Attachment/ EmbeddedDocumentBinaryObject [ mimeCode ]`	Specify the type of file. For example `mimeCode="application/pdf`
`Invoice/AdditionalDocumentReference/Attachment/ EmbeddedDocumentBinaryObject [ filename ]`	Specify the file name. For example `human_readable_original.pdf`
`Invoice/AdditionalDocumentReference/Attachment/ EmbeddedDocumentBinaryObject`	Specify the binary object that represents the attached file. For example `ZWNvc2lvIC0gY29ubmVjdGlvbnMgdGhhdCB3b3JrCg==`

Restrictions

You must create a group for each attachment.

Example

<ubl:Invoice>
    <cac:AdditionalDocumentReference>
        <cbc:ID>human_readable_original.pdf</cbc:ID>
        <cbc:DocumentDescription>original invoice as sent by email</cbc:DocumentDescription>
        <cac:Attachment>
            <cbc:EmbeddedDocumentBinaryObject mimeCode="application/pdf" filename="human_readable_original.pdf">ZWNvc2lvIC0gY29ubmVjdGlvbnMgdGhhdCB3b3JrCg==</cbc:EmbeddedDocumentBinaryObject>
        </cac:Attachment>
    </cac:AdditionalDocumentReference>
</ubl:Invoice>