with member [Measures].[NazwaMiesiaca]
as [Order Date].[Month].CurrentMember.Name
SELECT
{
	[Measures].[NazwaMiesiaca],
	[Measures].[Order Qty]
} ON COLUMNS,
HEAD
(
Order
(
	(
		DESCENDANTS([Order Date].[Hierarchy].[Year].&[2013],,LEAVES)
		),
			([Measures].[Order Qty]),
			BDESC
	),
	1) ON ROWS
FROM [Adventure Works2014]