http://sqlblog.com/blogs/marco_russo/archive/2011/02/24/attribute-overwriting-in-mdx.aspxJeffrey Wang wrote a great blog post about attribute overwriting in MDX that is very clear and full of helpful pictures to show what happens when you write an MDX statement that writes into your multidimensional space. This is very common in an MDX ScriptenCommunityServer 2.1 SP2 (Build: 61129.1)