Strange behavior with KEY0, KEY1, KEYn in SSAS

I just found that this query has different behavior (with breaking differences in result) with different builds of Analysis Services 2005.

This is the query (I used a bitmap because this query throws an error when I try to put it in text in Community Server blog¬†– if someone want to check this other issue…):

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With Analysis Services 2005 SP1 (build 9.00.2047) we get the expected result:

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When we move to Analysis Services 2005 SP2 (I tested with builds 9.00.3050, 9.00.3054, 9.00.3152) you get a different number of columns: the KEY0 keyword returns one column for each field that is part of a composite key, instead of only the required part.

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The good news is that the build 9.00.3175 (that you can obtain asking to PSS) returns to the right behavior of build 9.00.2047.

I looked for other information about this bug on the web but I haven’t found anything. This feedback seems very similar but it still doesn’t work with build 9.00.3175, thus it isn’t the same.

UPDATE: this issue is described in KB938585 that is part of KB936305 (that refers to build 3175). Thanks to Andrea for pointing me to the existing articles.