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Pentaho Documentation

Adjust for Calculated Members and Named Sets

If your Mondrian schema defines calculated members or named sets that reference MDX members without the dimension prefix, then you must set mondrian.olap.elements.NeedDimensionPrefix to false in your mondrian.properties file. Under all other conditions you would want to set this property to true because it increases Mondrian performance, as well as the readability of the schema XML file.