MercatorUi.Sig.SigStock sigStock = (MercatorUi.Sig.SigStock)MercatorUi.Sig._SigsStatic.SigByModule(MercatorUi.Sig._SigEnum.STOCK);
DateTime date = DateTime.Today;
sigStock.FifoUpdate(date, "stock.s_condition = '...'", out StringBuilder errors);
if (errors.Length > 0)
{
    // tenir compte des erreurs
}