AllowanceCharge on InvoiceLine

[Frank Eersels <frank.eersels@vmma.be>]

I have case where an AllowanceCharge is calculated on InvoiceLine level.

As I found in the UBL documentation, the LineExtensionAmount must include any discounts or surcharges.
So, in my case, LineExtensionAmount = PriceAmount - AllowanceCharge discount + AllowanceCharge surcharge.
However, when I try to validate the generated XML file on OIOUBL's website, I get an error stating the PriceAmount should be the same as the LineExtensionAmount.

I'm not sure what's wrong here. Here is an extract of the XML-file:

-<cac:InvoiceLine>
        <cbc:ID>3</cbc:ID>
        <cbc:InvoicedQuantity unitCode="EA">1</cbc:InvoicedQuantity>
        <cbc:LineExtensionAmount currencyID="EUR">3638.00</cbc:LineExtensionAmount>
        <cac:AllowanceCharge>
                <cbc:ChargeIndicator>false</cbc:ChargeIndicator>
                <cbc:SequenceNumeric>1</cbc:SequenceNumeric>
                <cbc:Amount currencyID="EUR">909.50</cbc:Amount>
                <cac:TaxCategory><cbc:ID schemeAgencyID="320" schemeID="urn:oioubl:id:taxcategoryid-1.1">StandardRated</cbc:ID>
                        <cbc:Percent>21.0000</cbc:Percent>
                <cac:TaxScheme><cbc:ID schemeAgencyID="320" schemeID="urn:oioubl:id:taxschemeid-1.1">63</cbc:ID><cbc:Name>Moms</cbc:Name>
                </cac:TaxScheme>
                </cac:TaxCategory>
        </cac:AllowanceCharge>
        <cac:TaxTotal>
                <cbc:TaxAmount currencyID="EUR">763.98</cbc:TaxAmount>
                        <cac:TaxSubtotal>
                                <cbc:TaxableAmount currencyID="EUR">3638.00</cbc:TaxableAmount>
                                <cbc:TaxAmount currencyID="EUR">763.98</cbc:TaxAmount>
                                <cac:TaxCategory><cbc:ID schemeAgencyID="320" schemeID="urn:oioubl:id:taxcategoryid-1.1">StandardRated</cbc:ID>
                                <cbc:Percent>21.0000</cbc:Percent>
                                <cac:TaxScheme><cbc:ID schemeAgencyID="320" schemeID="urn:oioubl:id:taxschemeid-1.1">63</cbc:ID><cbc:Name>Moms</cbc:Name>
                                </cac:TaxScheme>
                                </cac:TaxCategory>
                        </cac:TaxSubtotal>
        </cac:TaxTotal>
        <cac:Item>
                <cbc:Description>01/06/2013_za_A55_23:15:10_20s</cbc:Description>
                <cbc:Name>01/06/2013_za_A55_23:15:10_20s</cbc:Name>
                </cac:Item>
        <cac:Price>
                <cbc:PriceAmount currencyID="EUR">4547.50</cbc:PriceAmount>
                <cbc:BaseQuantity>1</cbc:BaseQuantity>
        </cac:Price>
</cac:InvoiceLine>

Thank
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