Simple MDX Filter Query

Question

Can anyone explain why this one fails :

WITH MEMBER [Measures].[T]
as
    Filter(
                [Customer].[Customer Name].Children,
                [Measures].[Sales] > 65042.79
        )
SELECT 
  [Measures].[T] on 0
FROM [SalesCube]

while this one is fine?

SELECT 
    Filter(
            [Customer].[Customer Name].Children,
            [Measures].[Sales] > 65042.79
        ) on 0
FROM [SalesCube]

The first one gives an errror

"The function expects a string or numeric expression for the argument. A tuplet set expression was used."

They look exactly the same to me.

Answer 1

Realised that it should have been

WITH SET [T]
as
    Filter(
                [Customer].[Customer Name].Children,
                [Measures].[Sales] > 65042.79
        )
SELECT 
  [Measures].[T] on 0
FROM [SalesCube]