Filtering hierarchies in MDX WITH clause - ssas

Question

By using the answer of MDX on multiple hierarchical dimensions I have the following MDX query:
with
member L1Y1 as ([Dim Location].[Hierarchy].[Center].&[1],
[Dim Date].[Calendar Date].[Year].&[2010],
[Measures].[x])
select ([Dim Attribute].[Parent Code].&[10000]) on 0,
({L1Y1}) on 1
from DS
Now the problem is how to filter the L1Y1 based on its children. For example suppose we want to filter it so that only season 2 and month 7 included in the query. The following query output is the same as above and the where clause has no effect:
with
member L1Y1 as ([Dim Location].[Hierarchy].[Center].&[1],
[Dim Date].[Calendar Date].[Year].&[2010],
[Measures].[x])
select ([Dim Attribute].[Parent Code].&[10000]) on 0,
({L1Y1}) on 1
from DS
where [Dim Date].[Calendar Date].[Season].&[2] and
[Dim Date].[Calendar Date].[Month].&[7]

Answer 1

Unless you removed the attributes you should have multiple hierarchies available in your time dimension. Can you try this :
with
member L1Y1 as ([Dim Location].[Hierarchy].[Center].&[1],
[Dim Date].[Calendar Date].[Year].&[2010],
[Measures].[x])
select ([Dim Attribute].[Parent Code].&[10000]) on 0,
({L1Y1}) on 1
from DS
where [Dim Date].[Season].&[2] and [Dim Date].[Month].&[7]
Note, as we are not using the hierarchy [Calendar Date] time member is not overwritten but filtered.

Answer 2

How about:
with
member L1Y1 as ([Dim Location].[Hierarchy].[Center].&[1],
[Dim Date].[Calendar Date].[Year].&[2010],
[Measures].[x])
member S2 as ([Dim Location].[Hierarchy].[Center].&[1],
[Dim Date].[Calendar Date].[Season].&[2],
[Measures].[x])
member M7 as ([Dim Location].[Hierarchy].[Center].&[1],
[Dim Date].[Calendar Date].[Month].&[7],
[Measures].[x])
select ([Dim Attribute].[Parent Code].&[10000]) on 0,
(L1Y1, S2, M7) on 1
from DS
I understand it is a somewhat more laborous approach, but you would get the result. If you otherwise want to get a single value only you can try keeping only the M7 measure.