START-OF-SELECTION.
Event keyword:
In an executable program, the corresponding event is processed after the selection screen has been displayed and before data is read using a logical database.
The REPORT statement always
executes a START-OF-SELECTION implcitly. Consequently
all processing logic between the REPORT statement and
the next event keyword is automatically processed in the START-OF-SELECTION
event.
Immediately afterwards, the system processes the statements that belong to an explicit START-OF-SELECTION block.
INITIALIZATION, END-OF-SELECTION
Description of Reporting Events