The MARK number is the Unique Registration Number attributed by myDATA to the supplier. The MARK number must be a positive integer.

When the supplier is Greek, there should be one invoice URL, and there can be no more than one invoice URL. This is the URL for the HTML copy of the Document.

More general information about additional document references is provided in the VRBL: Additional Document References topic.

Elements

Mark Number

Use the following subelements of the AdditionalDocumentReference element to specify the MARK number:

Element (Path)	Cardinality	Description
Additional Document Reference (`Invoice/AdditionalDocumentReference`)	0..n	A group of elements providing information about additional supporting documents substantiating the claims made in the invoice.
Additional Document Reference ID (`Invoice/AdditionalDocumentReference/ID`)	1..1	An identifier of the supporting document.
Additional Document Reference Description (`Invoice/AdditionalDocumentReference/DocumentDescription`)	0..1	A description of the supporting document.

Invoice URL

Use the following subelements of the AdditionalDocumentReference element to specify the Document's URL:

Element (Path)	Cardinality	Description
Additional Document Reference Description (`Invoice/AdditionalDocumentReference/DocumentDescription`)	0..1	A description of the supporting document.
External Document Location (`Invoice/AdditionalDocumentReference/Attachment/ ExternalReference/URI`)	1..1	The URL (Uniform Resource Locator) that identifies where the external document is located.

Restrictions

You must have one Invoice URL, but you cannot have more than one. This is the URL for the HTML copy of the Document.

Examples

MARK

The following example shows how to model the MARK:

<ubl:Invoice>
    <!-- Code omitted for clarity -->
    <cac:AdditionalDocumentReference>	
		    <cbc:ID>1234</cbc:ID>
		    <cbc:DocumentDescription>VRBL:GR:MARK</cbc:DocumentDescription>
	  </cac:AdditionalDocumentReference>
    <!-- Code omitted for clarity -->
</ubl:Invoice>

Document URL

The following example shows how to model the Document URL:

<ubl:Invoice>
    <!-- Code omitted for clarity -->
    <cac:AdditionalDocumentReference>
	     <cbc:ID/>
		   <cbc:DocumentDescription>VRBL:GR:INVOICEURL</cbc:DocumentDescription>
		   <cac:Attachment>
			  <cac:ExternalReference>
				  <cbc:URI>http://www.example.com/index.html</cbc:URI>
			  </cac:ExternalReference>
		   </cac:Attachment>
	  </cac:AdditionalDocumentReference>
    <!-- Code omitted for clarity -->
</ubl:Invoice>