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MDX

Hi. In the Advanced properties of any dimension we found "All Member Formula" or "Custom Rollup Formula" , what is mean???. Thank you.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/olapdmad/aglevels_344z.asp
Custom Rollup Formula
MDX expression used to override the default rollup of values in the level.
All Member Formula
The MDX expression used to override the default rollup of the all member.

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