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Debugging Tips for Composite Datastreams
The report design's MasterRow variable must be Static with Public visibility.
The overridden Fetch method must call Super::Fetch() before using it to create the global data row. If unexpected results occur, assign a breakpoint to the Fetch method (select the line to breakpoint and press F9) and inspect all report variables (Debug, then Variables). Make sure that the data row variable aMasterRow is being populated as expected.
The BuildFromRow method on a control can also be overridden for the purpose of using breakpoints to check the value of the MasterRow variable (and its fields) to confirm that MasterRow is exposing itself to the control.