public bool SaveGrid()
{
	(dgBatchNrGrid.View as TableView).PostEditor();
	if (!dgBatchNrGrid.HasUnsavedData) return true;

	var data = (dgBatchNrGrid.ItemsSource as IEnumerable<InvSerieBatchClientUserCustom>).ToList();

	var deletedRowItems = dgBatchNrGrid.DeletedRows.Select(x => x.DataItem).Cast<InvSerieBatchClientUserCustom>().ToList();
	var modifiedItems = data.Where(x => !deletedRowItems.Contains(x)).ToList();

	var addedItems = modifiedItems.Where(x => x.RowId == 0 && x.InvItem != null).ToList();
	var updatedItems = modifiedItems.Where(x => x.RowId != 0).ToList();
	var deletedItems = deletedRowItems.Where(x => x.RowId != 0).ToList();
	var result = TaskHelper.RunSync(() => SaveData(ApiHelpers.GetNewApi(api), OrderLine, addedItems, updatedItems, deletedItems));

	if (!result.Success)
	{
		busyIndicator.IsBusy = false;
		Uniconta.ClientTools.Util.UtilDisplay.ShowErrorCode(result.ErrorCode);
	}
	return result.Success;
}


public static async Task<ApiResult> SaveData(CrudAPI crudApi, CreditorOrderLineClientUserCustom orderLine, List<InvSerieBatchClientUserCustom> addedItems, List<InvSerieBatchClientUserCustom> updatedItems, List<InvSerieBatchClientUserCustom> deletedItems)
{
	var allBatchNummerLinks = await ApiHelpers.QueryWrapper(crudApi, api => api.Query<DCOrderLineSerieBatch>(orderLine));

	// Remove all changed batchnumber links, new links are created below
	var allChangedRowIds = LinqHelper.SelectMany(updatedItems.Select(y => y.RowId), deletedItems.Select(y => y.RowId)).ToHashSet();
	var allLinksToRemove = allBatchNummerLinks.Where(x => allChangedRowIds.Contains(x.InvSerieBatchRowId));
	ApiResult result;
	
	result = await ApiHelpers.MultiCrudNoRowId(crudApi, null, null, allLinksToRemove);
	if (!result.Success) return result;

	foreach (var item in addedItems)
		item.QtyMarked = item.Qty;

	result = await ApiHelpers.MultiCrudNoRowId(crudApi, addedItems, updatedItems, deletedItems);
	if (!result.Success) return result;

	var newLinks = LinqHelper.SelectMany(addedItems, updatedItems).Select(x => CreateBatchNumberLink<CreditorOrderLineClient>(x, orderLine, GetQuantity(x)));

	result = await ApiHelpers.MultiCrudNoRowId(crudApi, newLinks, null, null);
	if (!result.Success) return result;

	// We need to save updatedItems again to update the correct amount on the batchnummers.
	result = await ApiHelpers.MultiCrudNoRowId(crudApi, null, updatedItems, null);
	if (!result.Success) return result;

	orderLine.CachedBatchNumbers = null;
	return ApiResult.Ok();
}