What is the logic behind the start routine

Question

Dear One's,
Kindly take a moment and explain the logic behind this start routine written in update rules of ODS.
PROGRAM UPDATE_ROUTINE.
$$ begin of global - insert your declaration only below this line  -
$$ end of global - insert your declaration only before this line   -
The follow definition is new in the BW3.x
TYPES:
  BEGIN OF DATA_PACKAGE_STRUCTURE.
     INCLUDE STRUCTURE /BIC/CST_T07_O006.
TYPES:
     RECNO   LIKE sy-tabix,
  END OF DATA_PACKAGE_STRUCTURE.
DATA:
  DATA_PACKAGE TYPE STANDARD TABLE OF DATA_PACKAGE_STRUCTURE
       WITH HEADER LINE
       WITH NON-UNIQUE DEFAULT KEY INITIAL SIZE 0.
FORM startup
  TABLES   MONITOR STRUCTURE RSMONITOR "user defined monitoring
           MONITOR_RECNO STRUCTURE RSMONITORS " monitoring with record n
           DATA_PACKAGE STRUCTURE DATA_PACKAGE
  USING    RECORD_ALL LIKE SY-TABIX
           SOURCE_SYSTEM LIKE RSUPDSIMULH-LOGSYS
  CHANGING ABORT LIKE SY-SUBRC. "set ABORT <> 0 to cancel update
$$ begin of routine - insert your code only below this line        -
fill the internal tables "MONITOR" and/or "MONITOR_RECNO",
to make monitor entries.
DATA: ITAB_/BIC/AT07_O00600 TYPE SORTED TABLE OF /BIC/AT07_O00600
      WITH HEADER LINE
      WITH UNIQUE DEFAULT KEY INITIAL SIZE 0,
      DATA_PACKAGE_NEW TYPE STANDARD TABLE OF DATA_PACKAGE_STRUCTURE
      WITH HEADER LINE
      WITH NON-UNIQUE DEFAULT KEY INITIAL SIZE 0.
sort the datapackage based on lead number and lead program definition
SORT DATA_PACKAGE BY /BIC/TLDNR /BIC/TLDPRGFTE.
from the resources ODS read all lead values based on the values those
SELECT * FROM /BIC/AT07_O00600 INTO TABLE
         ITAB_/BIC/AT07_O00600
         FOR ALL ENTRIES IN DATA_PACKAGE
         WHERE /BIC/TLDNR = DATA_PACKAGE-/BIC/TLDNR.
FIELD-SYMBOLS: <LS_DATA_PACKAGE> TYPE DATA_PACKAGE_STRUCTURE.
FIELD-SYMBOLS: <LS_/BIC/AT07_O00600> TYPE /BIC/AT07_O00600.
loop at internal table of ODS to check if there are lead program defin
from the source which mean the values of lead program definition in OD
values of lead program definition in datapackage.
   LOOP AT ITAB_/BIC/AT07_O00600 ASSIGNING <LS_/bic/at07_o00600>.
     READ TABLE DATA_PACKAGE
      TRANSPORTING NO FIELDS
      WITH KEY
      /BIC/TLDNR = <LS_/bic/at07_o00600>-/BIC/TLDNR
      /BIC/TLDPRGFTE = <LS_/bic/at07_o00600>-/BIC/TLDPRGFTE
      BINARY SEARCH.
      IF SY-SUBRC <> 0.
new lines with zero values are inserted because there are no correspon
DATA_PACKAGE_NEW-/BIC/TLDNR = <LS_/BIC/AT07_O00600>-/BIC/TLDNR.
DATA_PACKAGE_NEW-/BIC/TLDPRGFTE = <LS_/BIC/AT07_O00600>-/BIC/TLDPRGFTE.
  DATA_PACKAGE_NEW-/BIC/TLDFTE = 0.
  APPEND DATA_PACKAGE_NEW.
     ENDIF.
  ENDLOOP.
append the new records which are created for the leads in the datapack
  APPEND LINES OF DATA_PACKAGE_NEW TO DATA_PACKAGE.
reset the sorting of the datapackage back to its original state
  SORT DATA_PACKAGE.
if abort is not equal zero, the update process will be canceled
  ABORT = 0.
$$ end of routine - insert your code only before this line         -
ENDFORM.
Thanks in advance

Answer 1

hi,
it's retrieve data from table /BIC/AT07_O00600
and add to data package, so your records will be more than from source
hope this helps.