The Installation Serial Number identifies the installation that issued the Document. This is as it is declared in the Tax Authority's register.

Use the InstallationSerialNumber element Extension to model the number.

This information is used to create the Invoice Number that is required by the AADE, as described in the Greece: Invoice Number Patterns topic

Elements

Element	Description
`Invoice/UBLExtensions/UBLExtension/ExtensionContent/InvoiceExtension/ InstallationSerialNumber`	Specify the serial number of the installation.

Restrictions

If the number represents a headquarters, it must begin with a zero.

Example

<ubl:Invoice>
    <cec:UBLExtensions>
        <cec:UBLExtension>
            <cec:ExtensionContent>
                <vrbl:InvoiceExtension>
                    <!-- Code omitted for clarity -->
                    <vrbl:InstallationSerialNumber>99887744</vrbl:InstallationSerialNumber>
                    <!-- Code omitted for clarity -->
                </vrbl:InvoiceExtension>
            </cec:ExtensionContent>
        </cec:UBLExtension>    
    </cec:UBLExtensions>
    <!-- Code omitted for clarity -->
</ubl:Invoice>