Event Parsing by ABAP interpreter

Hi all,

In my quest to improving my understanding of SAP ABAP, I have come accross a question, which is as follows:

When writing events such as Top-of-page, start-of-selection, etc. we do specify the name of the event & then write the processing statements.

However, there is no closing statement for the event unlike other structures/blocks like if..endif, module..endmodule, etc.

When the ABAP interpreter parses the code, how does it differentiate the statements to be included within the event block from the other following statements?

For example, how does the interpreter determine that the value assigment of SOME_INDICATOR is not to be processed in START-OF-SELECTION?

*******************************************************

• S T A R T O F S E L E C T I O N E V E N T *

*******************************************************

START-OF-SELECTION.

DBCNT = -1.

SELECT

MATKL

MATNR

MEINS

MTART

MTPOS_MARA

INTO

CORRESPONDING FIELDS OF TABLE IT_MM

FROM

MARA.

DBCNT = SY-DBCNT.

*********************************************************

• THIS BLOCK IS TO BE PROCESSED FOR INFORMATION DISPLAY *

*********************************************************

SOME_INDICATOR = 1.

WRITE 'TITLE OF THE REPORT COMES HERE'.

LOOP AT IT_MM.

WRITE: /1 IT_MM-MATNR , 17 SY-VLINE,

18 IT_MM-MTART , 32 SY-VLINE,

71 IT_MM-MEINS , 87 SY-VLINE,

88 IT_MM-MATKL , 103 SY-VLINE,

123 IT_MM-MTPOS_MARA , 141 SY-VLINE.

ENDLOOP.

How do I tell the interpreter to process a set of statements within a certain event block and leave out the rest?

Please clarify...

Regards,

Madhur