In aggregate storage databases, formulas must be written as numeric value expressions in the MDX language. Formulas are permitted only on members of dynamic hierarchies and on the accounts dimension. You can specify a solve order for formulas within a dimension.
Formulas are calculated only at retrieval time; calculated formula values are not stored.
To create or edit formulas:
The Outline tab is displayed.
Right-click a member to which a formula is attached, and select Edit member properties.
In the Member Properties dialog box, select the Formula tab.
Following MDX syntax, enter a formula in the text box provided.
Optional: Use a predefined template to generate your formula:
Click OK to save the formula.
“Developing Formulas on Aggregate Storage Outlines” in the Oracle Essbase Database Administrator's Guide
Specifying Calculation Order for Members and Dimensions in Aggregate Storage Databases
“Calculating Aggregate Storage Databases” in the Oracle Essbase Database Administrator's Guide
Oracle Essbase API Reference