Problem in modifying existing records in dbtab

Question

Hi Experts,
I am doing a report where I have created two dbtab's , one for data getting saved and
other for fetching data and modifying exsiting records..
For eg - let ZABC be the table where I need to insert or update records and ZXYZ is the table where
I need to fetch and modify existing records.
Now my probelm is :
In case of inserting new records (multiple records ) into my dbtab ( ZABC ) its working ,
but modifying existing records in another dbtab (ZXYZ ) its not wroking !! plz advice !!
If my select querry for modifying exsiting records is:
SELECT *  FROM ZXYZ  INTO TABLE ITAB WHERE MATNR EQ S_MATNR.
*****then its inserting a newline along with the existing records.
but when my querry is,
SELECT single *  FROM ZXYZ  WHERE MATNR EQ S_MATNR.
then its modifying the existing records, but only the first record.
Loop at itab.
if sy-tabix  = 1.
zabc-matnr = matnr.
zabc-idnrk  = idnrk.
zabc-budat = s_budat.
zabc-menge = menge1.
ZXYZ-menge = ZABC-Menge + MENGE1.
ZXYZ-BALC  = ZXYZ-Menge   -   MENGE1.
ELSEIF sy-tabix  = 2.
zabc-matnr = matnr.
zabc-idnrk  = idnrk.
zabc-budat = s_budat.
zabc-menge = menge2.
ZXYZ-menge = ZABC-Menge + MENGE2.
ZXYZ-BALC  = ZXYZ-Menge  -  MENGE2.
ELSEIF sy-tabix  = 3.
zabc-matnr = matnr.
zabc-idnrk  = idnrk.
zabc-budat = s_budat.
zabc-menge = menge3.
ZXYZ-menge = ZABC-Menge + MENGE3.
ZXYZ-BALC  = ZXYZ-Menge   -  MENGE3.
ENDIF.
INSERT ZABC.
IF SY-SUBRC EQ 0.
MODIFY ZXYZ.
        IF SY-SUBRC = 0.
          MESSAGE : I002 WITH 'RECORD CREATED'.
            ENDIF.
ENDIF.
Please advice
Karthik
Edited by: Karthik R on Aug 24, 2009 9:42 PM

Answer 1

Hi,
This is because in the second case you are not selecting records into an internal table.
As a result only the first record which satisfies the where condition is fetched.
Check if the program goes into the loop when you write second select query.
KR Jaideep,