MDX Filtering dimension members with result of other dimension - ssas

Question

I would like to filter a dimension for cube security with some information that are in another dimension.
So - I have a dimension which holds some account Responsible (Account Number and the initials on the one responsible) and another Dimension with all accounts.
I would like to make sure, that a person only can see movements on the accounts on which they are responsible.
I can make the filtering work like this:
SELECT
{} ON 0
,{
Exists
(
Filter
(
[Accounts].[Accounts].[AccountNo]
*
[AccountResponsible].[AccountResponsible].[AccountNo]
,
[Accounts].[Accounts].Properties("key")
=
[AccountResponsible].[AccountResponsible].Properties("key")
)
,[AccountResponsible].[Responsible].&[MSA]
)
} ON 1
FROM mycube;
the problem is, that there are two columns, and I can't use that in cube security. Is there a way to rewrite this, so that I actually get only one column with the members that the user are allowed to see?

Answer 1

Try using the Extract function:
SELECT
{} ON 0
,
EXTRACT(
{
Exists
(
Filter
(
[Accounts].[Accounts].[AccountNo]
*
[AccountResponsible].[AccountResponsible].[AccountNo]
,
[Accounts].[Accounts].Properties("key")
=
[AccountResponsible].[AccountResponsible].Properties("key")
)
,[AccountResponsible].[Responsible].&[MSA]
)
}
,[Accounts].[Accounts] //<<HIERARCHY YOU WISH TO EXTRACT
) ON 1
FROM mycube;