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:LotNumberID")
        billingEngine.EinvAddNode(e.eInvoiceEnum, e.ParentNode, "cbc:ExpiryDate", MercatorController.xFunctions.xLookUpDateTime("ARTLOT", "ID_LOT", e.DrLigne["id_lot"], "perempt"));
}