Determines whether a summary of running values is performed. Possible values are 0 - ddSRNone: Does not perform this summary calculation (default), 1 - ddSRGroup: Calculates the summary of running values for each range of specified total values, or 2 - ddSRAll: Calculates the summary of running values of all values in the Report, regardless of groupings. This property is only valid when the SummaryType property is different from 0 (zero).