ABAP Programs: Selection screen events

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REPORT ZSOURCE1603 MESSAGE-ID SU.
* Worka area
TABLES CUSTOMERS.
* Selection criteria
PARAMETERS PCODE LIKE CUSTOMERS-POSTCODE.
SELECT-OPTIONS S_NAME FOR CUSTOMERS-NAME.
* Variables
DATA: PARAMETER_LENGTH TYPE I,
     NUMBER_OF_SELECTIONS TYPE I.
* Checking user input in Parameter pcode
AT SELECTION-SCREEN ON PCODE.
 PARAMETER_LENGTH = STRLEN( PCODE ).
 IF PARAMETER_LENGTH < 5.
   MESSAGE E000 WITH 'ZIP code invalid'.
 ENDIF.
* Checking user input in Select-Option s_name
AT SELECTION-SCREEN ON S_NAME.
 DESCRIBE TABLE S_NAME LINES NUMBER_OF_SELECTIONS.
 IF NUMBER_OF_SELECTIONS = 0.
   MESSAGE E000 WITH 'Please specify name of customer'.
 ENDIF.
* Processing data
START-OF-SELECTION.
 SELECT * FROM CUSTOMERS
        WHERE NAME IN S_NAME.
   WRITE / CUSTOMERS-NAME.
 ENDSELECT.