Good call jsobell.  Thanks for the help!

        private void Updated()
        {
            foreach (var parcel in this.Parcels)
            {
                var verifications = parcel.VerifierEngine.Execute(parcel);

                this.ValidationResults.Clear();

                if (!verifications.AreOk)
                {
                    var errors = string.Empty;
                    foreach (var error in verifications.Errors)
                    {
                        errors += error.Description + Environment.NewLine;
                    }

                    MessageBox.Show(errors, "Could not Save", MessageBoxButton.OK);
                    return;
                }
            }

            this.Shipment.Value.GenerateWaybillNumber();

            this.Gateway.EntityManager.SaveChangesAsync(this.Finished, null);
        }

        private void Finished(EntitySavedEventArgs args)
        {
            if (args.Error != null || args.Result == null || !args.Result.Ok)
            {
                throw new Exception("An error occurred while saving the Shipment", args.Error);
            }
            else
            {
                DataNotificationService.UpdateShipments();
                PopupWindowService.ClosePopUp();
            }
        }