Error "Members, tuples or sets must use the same hierarchies in the function" in MDX

Question

the following MDX returns error: "Members, tuples or sets must use the same hierarchies in the function"
WITH
MEMBER [Measures].[Prev Year] AS
[Measures].[returns],
PARALLELPERIOD
[Exec Date].[Year].Levels('Year'),
1,
[Exec Date].[Year].CURRENTMEMBER
MEMBER [Measures].[Prev Month] AS
[Measures].[returns],
PARALLELPERIOD
[Exec Date].[Month Num].Levels('Month Num'),
1,
[Exec Date].[Month Num].CURRENTMEMBER
MEMBER [Measures].[Prev Day] AS
[Measures].[returns],
PARALLELPERIOD
[Exec Date].[Day].Levels('Day'),
1,
[Exec Date].[Day].CURRENTMEMBER
SELECT NON EMPTY { StrToMember("@ExecDateLevel"), [Measures].[returns] } ON COLUMNS, NON EMPTY { ([Employees].[Company].[Company].ALLMEMBERS ) } DIMENSION PROPERTIES MEMBER_CAPTION, MEMBER_UNIQUE_NAME ON ROWS FROM (
SELECT (
STRTOSET(@ExecDateHierarchy, CONSTRAINED)
) ON COLUMNS FROM [cbSales]) WHERE ( IIF( STRTOSET(@ExecDateHierarchy, CONSTRAINED).Count = 1, STRTOSET(@ExecDateHierarchy, CONSTRAINED), [Exec Date].[Hierarchy].currentmember ) ) CELL PROPERTIES VALUE, BACK_COLOR, FORE_COLOR, FORMATTED_VALUE, FORMAT_STRING, FONT_NAME, FONT_SIZE, FONT_FLAGS
and when I replace "StrToMember(@ExecDateLevel)" with
StrToMember("[Measures].[Prev Month]") the MDX is compiled correctly.
what is the problem?
How can I solve that?

Answer 1

Hi Breceive,
In your scenario, the issue is caused by that you select dimension members and measures on the same axis without a crossjoin.
SELECT NON EMPTY {  StrToMember("@ExecDateLevel"), [Measures].[returns] } ON COLUMNS
To avoid this issue, you can use the query below.
WITH
MEMBER [Measures].[Prev Year] AS
[Measures].[returns],
PARALLELPERIOD
[Exec Date].[Year].Levels('Year'),
1,
[Exec Date].[Year].CURRENTMEMBER
MEMBER [Measures].[Prev Month] AS
[Measures].[returns],
PARALLELPERIOD
[Exec Date].[Month Num].Levels('Month Num'),
1,
[Exec Date].[Month Num].CURRENTMEMBER
MEMBER [Measures].[Prev Day] AS
[Measures].[returns],
PARALLELPERIOD
[Exec Date].[Day].Levels('Day'),
1,
[Exec Date].[Day].CURRENTMEMBER
SELECT NON EMPTY { StrToMember("@ExecDateLevel")*[Measures].[returns] } ON COLUMNS, NON EMPTY { ([Employees].[Company].[Company].ALLMEMBERS ) } DIMENSION PROPERTIES MEMBER_CAPTION, MEMBER_UNIQUE_NAME ON ROWS FROM (
SELECT (
STRTOSET(@ExecDateHierarchy, CONSTRAINED)
) ON COLUMNS FROM [cbSales]) WHERE ( IIF( STRTOSET(@ExecDateHierarchy, CONSTRAINED).Count = 1, STRTOSET(@ExecDateHierarchy, CONSTRAINED), [Exec Date].[Hierarchy].currentmember ) ) CELL PROPERTIES VALUE, BACK_COLOR, FORE_COLOR, FORMATTED_VALUE, FORMAT_STRING, FONT_NAME, FONT_SIZE, FONT_FLAGS
Here is a similar thread for you reference.
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/3c21d9a8-640d-4dde-bc76-08d1fcbb3a31/multiple-dimension-query?forum=sqlanalysisservices
Regards,
Charlie Liao
TechNet Community Support