[AcceptPost]
        [AcceptAjax]
        [RequiresPermission(Permission.TakeOffItemsUpdate, Permission.TakeOffItemsAdd, MustMatchAll = false)]
        public PartialViewResult AddGroupQuantity(long takeOffItemId)
        {
            var timestamp = _getTakeOffItemService.GetTimestamp(takeOffItemId);
            var model = new TakeOffItemsAddGroupQuantityViewModel
                            {
                                Id = takeOffItemId,
                                Timestamp = timestamp
                            };
            return PartialView(model);
        }