Error in MDX Calculated Measure syntax in SSAS

I have been getting error for the below calculated measure.

CREATE MEMBER CREATECUBE.[Measures].WOP

AS

CASE

WHEN ([Month].[Year].members >= "2011")

then [Measures].[M1]

else [Measure].[M2]

end,

Visible=1;

Scenario - Wen the year is <=2011, measure1 should get displayed else measure2.

wen i hardcode the year ([Month].[Year].&[2011]), it works

Could anyone please help me on this or provide better solution?

Thanks in advance!!

Get this working?  I think you could do this with an immediate IIF statement.

IIF([Month].[Year].members >= 2011,Measures.M1,Measures.M2)

CREATE MEMBER CREATECUBE.[Measures].WOP

AS

IIF([Month].[Year].currentmember.properties("key") <= 2011, [Measures].[M1], [Measures].[M2]),

visible = 1;

Please let me know if this works. Also, note that the key column of the [Year] level should be the year.

Thanks,

Anish