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The following dialogs are available to set properties of query components: ... Selection/Formula properties ...
Tab Page: Aggregation
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Calculate After Aggregation: This field is only displayed for calculated key figures; it is not displayed for formulas. It is used for display and stipulates that the formula of the calculated key figure is calculated after aggregation. If you use calculated key figures that you defined in SAP BW 3.5, you can use this field to specify whether the formula is to be calculated before or after aggregation.
http://help.sap.com/saphelp_nw04s/helpdata/en/d2/02223c5f00612be10000000a11402f/content.htm