Heirarchy Already Appears In The Axis1 Axis

Hi All,

I'm using VS2005 and I'm trying to create a report but two of the parameter, I think, have the same heirarchy?
Well, I am getting this error when I go to view the report:

An error occurred during local report processing.
An error has occurred during report processing.
Query execution failed for data set 'dsWorkItemHistory'
The System_State heirarchy already appears in the axis1 axis
My problem is I want one parameter to be WorkItemType and another parameter to be WorkItemState.
For WorkItemTypeParam
I have:


Parameter: WorkItemTypeParam
Dimension: Work Item
Hierarchy: Work Item.Work Item Type
Multi-Value with Default All
For WorkItemState
I have:


Parameter: WorkItemState
Dimension: Work Item
Hierarchy: Work Item.State
Multi-Value with Default All
My Dataset is:

WITH

MEMBER

[Measures].[Date Key] AS

[Date].[Date].CurrentMember.UniqueName

MEMBER

[Measures].[Moving Average] as

AVG({[Date].[Date].currentmember.lag(@IterationParam):

[Date].[Date].currentmember},[Measures].[Configuresoft_ComplexityRank])

SELECT

{

[Measures].[Date Key],

[Measures].[Configuresoft_ComplexityRank],

[Measures].[Moving Average]



} ON COLUMNS,

(

[Work Item].[System_State].[System_State],

(StrToMember(@StartDateParam):StrToMember(@EndDateParam))

)

ON ROWS

FROM [Team System]

WHERE

(

STRTOMEMBER("[Team Project].[Team Project].["+@Project+"]"),

STRTOSET(@IterationParam),

STRTOSET(@AreaParam),

STRTOSET(@AssignedTo),

STRTOSET(@WorkItemTypeParam),

STRTOSET(@WorkItemState)

)


Does anyone have any suggestions on this?

Thanks,
Nici