Problem about dynamic value when putting expression after &

Hi,

I've got the problem with MDX. The thing is that I would like to create the dynamic dimension after the & character.

For example, the below statement works fine with month(now()) function:

SELECT ([Measures].[Ex Rate SEK/NOK CT]) ON 0
FROM [Datavarehus Choice]
WHERE
strtomember("[Exchange Rate Type].[Exchange Rate Type].&[Forcast Q" + CSTR(MONTH(NOW()))
+ " " + CSTR(YEAR(NOW())) + "]")

However, when I try to put the dimension after & like:

SELECT
([Measures].[Ex Rate SEK/NOK CT]) ON 0
FROM [Datavarehus Choice]
WHERE
strtomember("[Exchange Rate Type].[Exchange Rate Type].&[Forcast Q" + CSTR(MONTH([Col Date H].[Col Dato].&[2013-01-11T00:00:00])) + " " + CSTR(YEAR(NOW())) + "]")

It doesn't work and I got the error below. If anyone can help on this, would be very much appreciated.