This is an event key word.
Before the first logical database table access, it introduces any
initial processing to be executed prior to the block specified under
the next event key word
The REPORT statement
automatically starts the START-OF-SELECTION processing. Any
processing between the REPORT statement and the subsequent event
key word is executed at START-OF-SELECTION .
Immediately after, the processing block introduced by an explicit
START-OF-SELECTION is executed.
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