public async Task <IEnumerable <SystemLookupItemModel> > GetItems()
        {
            var entitites = await _systemLookupItemManager.GetItemsAsync();

            if (!entitites.Any())
            {
                throw new SystemLookupItemsNotFoundException();
            }

            var model = SystemLookupItemModel.Construct(entitites);

            return(model);
        }