rs:about the Scope parameter of a aggregate function

A valid scope is the name of a grouping, dataset, or data region. Only groupings or data regions valid scope is the name of a grouping, dataset, or data region. Only groupings or data regions .
the meaning of data region? for example?See my response on the public RS newsgroup:

A data region is a list, matrix, table, or chart.
Please check Reporting Services BOL for more information, e.g.:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/rscreate/htm/rcr_creating_structure_objects_v1_8epf.asp

-- Robert