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:ID") && ((e.ParentNode.Name == "cac:InvoiceLine") || (e.ParentNode.Name == "cac:CreditNoteLine")) && (e.DrLigne["memo"].ToString() != string.Empty))
        billingEngine.EinvAddNode(e.eInvoiceEnum, e.ParentNode, "cbc:Note", e.DrLigne["memo"].ToString());
}