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This task is a step in Process of Using Composite Datastreams in a Report.
In this topic, you modify the master datastream component so that it can obtain the data for its data row component from the global data row variable. This is accomplished by overriding the Fetch method on the master datastream.
After determining the fetched record is not empty, the code in the Fetch method sets the MasterRow global variable to the contents of the row returned by the Super::Fetch operation. Each time a master datastream record is obtained, the record in memory in MasterRow is replaced.
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