public string SavePurchaseRequisition(List<PurchaseRequisitionBLL> purchaseRequisitions, string warehouseId, string narration)
        {
            PurchaseRequisitionDAL purchaseRequisition = new PurchaseRequisitionDAL();

            try
            {
                LumexDBPlayer db = LumexDBPlayer.Start(true);
                string purchaseRequisitionId = purchaseRequisition.SavePurchaseRequisition(purchaseRequisitions, warehouseId, narration, db);
                db.Stop();

                return purchaseRequisitionId;
            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                purchaseRequisition = null;
            }
        }