MDX error with aggregate - ssas

Question

I have the following query with MDX
CREATE
MEMBER CURRENTCUBE.[Measures].[Estimating Accuracy Labour Hours] AS
Sum
(
CASE
WHEN
(1
-
[Measures].[Estimation Difference]
/
Aggregate
(
[Measures].[Actual Labour Hours]
,[DISTRICTS D].[District]
,[WORK D].[Work].[Work Description]
)
)
* 100
> 0
THEN
(1
-
[Measures].[Estimation Difference]
/
Aggregate
(
[Measures].[Actual Labour Hours]
,[DISTRICTS D].[District]
,[WORK D].[Work].[Work Description]
)
)
* 100
ELSE 0
END
)
,VISIBLE = 1
,ASSOCIATED_MEASURE_ = 'WORK F' ;
I got the following error
MdxScript(TEST) (52, 71) Too many arguments were passed to the
AGGREGATE function. The maximum argument count for the function is 2.
How to resolve it ?

Answer 1

The error is easier to understand than most MDX error messages!
You have three arguments in this snippet:
Aggregate
(
[Measures].[Actual Labour Hours]
,[DISTRICTS D].[District]
,[WORK D].[Work].[Work Description]
)
Here is the MSDN definition: https://msdn.microsoft.com/en-us/library/ms145524.aspx
Aggregate(Set_Expression [ ,Numeric_Expression ])
Following this definition, move your Numeric_Expression to the end and the other expressions in front of it:
Aggregate
(
,[DISTRICTS D].[District]
,[WORK D].[Work].[Work Description]
,[Measures].[Actual Labour Hours]
)
Still should be erroring. You then need to make a tuple set out of the first two arguments:
Aggregate
(
{(
[DISTRICTS D].[District]
,[WORK D].[Work].[Work Description]
)}
,[Measures].[Actual Labour Hours]
)
Your error message should now go away.