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ABAP Keyword Documentation → ABAP − Reference → Program structure → Modularization Statements → Event Blocks →Reporting Events
Event key words for reporting events include:
Reporting events occur in a predefined sequence and only in executable programs started using SUBMIT. In general, every executable program is implicitly started using SUBMIT. Only when a regular transaction code (not a reporting transaction) is used for the start (or external calls of their procedures), is a SUBMIT not triggered.
When an executable program is associated with a logical database, the assigned subroutine is executed in the database program before a reporting event is triggered.