Use CurrentSummary to determine which of the active summaries is used to provide values to clients of the data store. CurrentSummary returns 0 if the first active summary is the current summary. CurrentSummary returns SummaryCount-1 if the last active summary is the current summary. 

The dataset specified by the DataSet property provides all the fields that make up the dimensions and summaries of the dimension map. At any time, a subset of all the dimensions and summaries provided by the dataset is cached by the crosstabulated data store and available to decision source objects. Of all the active (cached) summaries, only one can be provided to decision source objects at a time. That one summary is the current summary. 

DataSet 

DimensionMap 

GetSummaryName 

SummaryCount