void BillingEngine_EinvNodeAdded(object sender, MercatorUi.Engine.Gescom.BillingEngine.EinvNodeAddedEventArgs e)
{
    MercatorUi.Engine.Gescom.BillingEngine billingEngine = (MercatorUi.Engine.Gescom.BillingEngine)sender;
    if ((e.Node.Name == "cbc:LineExtensionAmount") && ((e.ParentNode.Name == "cac:InvoiceLine") || (e.ParentNode.Name == "cac:CreditNoteLine")) && (Convert.ToDateTime(e.DrLigne["date_livr"]) > new DateTime(1900, 1, 1)))
    {
        XmlNode n = billingEngine.EinvAddNode(e.eInvoiceEnum, e.ParentNode, "cac:Delivery");
        billingEngine.EinvAddNode(e.eInvoiceEnum, n, "cbc:ActualDeliveryDate", Convert.ToDateTime(e.DrLigne["date_livr"]));
    }
}