Parser: The Following Syntax Error Occurred During Parsing: Invalid Token, Line 1, Offset 67, ? .

I'm sure I am not undestanding some basic concept here but the following formula always produces an invalid token error at the '-' sign. In this example, I'm trying to subtract out a specific month from the total (this is a simplified example, my actual formula needs to compute a % change over time using lag...)


This produces the invalid token error (it always errors at the '-' in the equation)

with member [Measures].[MyCalcMeasure] as [Measures].[MyBaseMeasure]-([Date Submitted].[Date Submitted YQMD].[month].&[2008]&[1],[Measures].[MyBaseMeasure])
select [Measures].[MyCalcMeasure] on columns,
[MyDim].[MyHierarchy].[Level1].members on rows
from MyCube

But this works

with member [Measures].[MyCalcMeasure] as [Measures].[MyBaseMeasure]
select [Measures].[MyCalcMeasure] on columns,
[MyDim].[MyHierarchy].[Level1].members on rows
from MyCube


As does this

with member [Measures].[MyCalcMeasure] as ([Date Submitted].[Date Submitted YQMD].[month].&[2008]&[1],[Measures].[MyBaseMeasure])
select [Measures].[MyCalcMeasure] on columns,
[MyDim].[MyHierarchy].[Level1].members on rows
from MyCube


What am I missing?