Analysis :: Dynamic MDX - Select From 2 Cubes

I am trying to select from 2 cubes. in one condition - select .. From CubeX, and in sec Condition Select .. From CubeY.

I tried to put the name of the Cube as parameter:
SELECT ...
FROM @CurrentCube

in ssrs source and i got the message:
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Failed to parse the query to detect if it is MDX or DMX. Error: 'Query (148, 6) Parser: The syntax for '@CurrentCube' is incorrect.' (MDXQueryGenerator)
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Also tried to get the name of the Cube as Member (I have a property with the name of the cube),and than using the member to the select :

WITH MEMBER [CurrentCube] AS
...[dim name].CURRENTMEMBER.PROPERTIES("Cube")
SELECT ...
FROM [CurrentCube]

It didnt work too.. Is it Possible at all make the Cube-name dynamic?!