Hello Ed,

If you define an attribute relationship and you define a hierarchy
including 2 attributes of the relatiionship, you could see the lowever
level attribute can aggregate properly to upper level attribute.

By default, an attribute relationship is automatically defined between the
key attribute and each non-key attribute of the dimension. Also, an
attribute relationship is automatically created between attributes have
one-to-many relationship defined in dimension tables.

However, for some natural hierarchies you have to define attribute
relationship yourselves.

Attribute relationships are an important part of dimension design.  They
help the server optimize storage of data, define referential integrity
rules within the dimension, control the presence of member properties, and
determine how MDX restrictions on one hierarchy affect the values in
another hierarchy.

You could refer to the following articles for more related information:

Attribute Relationships
http://msdn2.microsoft.com/en-us/library/ms174557.aspx

OLAP Design Best Practices for Analysis Services 2005
http://www.microsoft.com/technet/prodtechnol/sql/bestpractice/olapdbpssas200
5.mspx

If anything is unclear or you have furhter questions, please feel free to
let's know.

Best Regards,

Peter Yang
MCSE2000/2003, MCSA, MCDBA
Microsoft Online Community Support
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