What is the event block that all of your code changes belong to if you do not explicitly code any event blocks in an executable program?

In an executable program in ABAP (Advanced Business Application Programming), if you do not explicitly code any event blocks, all of your code changes will belong to the START-OF-SELECTION event block. This is an important aspect of the program flow in SAP.

The START-OF-SELECTION event is triggered after the INITIALIZATION event—where variables are set up and any required initialization of the program occurs, but before any output is presented. It serves as the main processing block where the core logic of the program is executed. Any declarations and processing statements that you write in the body of your program are considered to be part of this event if no other specific event blocks are coded.

This structure is foundational because it clearly delineates the point in the program where the actual logic begins to take effect, ensuring that the program behaves predictively and consistently, adhering to the workflow expected by SAP applications. This allows developers to organize their code efficiently, focusing the main logic in a standardized event block recognized by the SAP runtime.