Report Studio Crosstab with changing Dimension

[Crurraca2010]

Hi,

I am trying to build a "SCD dimension" with surrogate key in BI 8.3, I have:

Dimension
==========

ID_Dim BK_LEVEL3 BK_LEVEL2 BK_LEVEL1
1 BK1_L3 BK1_L2 BK1_L1
2 BK2_L3 BK1_L2 BK1_L1
3 BK3_L3 BK2_L2 BK1_L1
4 BK1_L3 BK2_L2 BK1_L1


FACTS
==========
TIME ID_DIM MEASURE
01/01/2010 1 10
01/01/2010 2 20
01/01/2010 3 30
01/02/2010 4 15
01/02/2010 2 20
01/02/2010 3 30


So, in 01/01/2010 dimension is:

BK1_L1
BK1_L2 BK2_L2
BK1_L3 BK2_L3 BK3_L3


And in 01/02/2010:

BK1_L1
BK1_L2 BK2_L2
BK2_L3 BK3_L3 BK1_L3


In a crosstab in Report Studio the element BK1_L3 is duplicated, and I need to consider that it's the same element:

Crosstab:

Time ( month)
MEASURE 01/01/2010 01/02/2010
BK1_L3 10
BK2_L3 20 20
BK3_L3 30 30
BK1_L3 15


and aggregations by year are wrong too:

Time ( year)
MEASURE 2006
BK1_L3 10
BK2_L3 40
BK3_L3 60
BK1_L3 15


I know they are different elements in BD because of the Id, but is it possible to aggregate by label instead Id?

Thanks,

Cristian