Language Reference Guide : 4. System Classes : DataStream Class : Breaks Attribute
 
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Breaks Attribute
Data Type: array of BreakSpec
4GL Access: R
The Breaks attribute stores the DataStream's data breaks in sorted order by break level. Data streams support data breaks for each row returned. You must specify which columns in the frame are to serve as data breaks. Data breaks are hierarchically ordered, with breaks at the outermost level taking precedence over inner ones.
Because this attribute is read only, the only way to set it is to use the AddBreak Method.