Problems with READ STATEMENT

Question

Hello ABAPers,
I have this code:
  SELECT ebeln bukrs
  FROM ekko
  INTO TABLE it_ekko
  FOR ALL ENTRIES IN idata
  WHERE ebeln = idata-vbeln_p.
  LOOP AT idata WHERE ebeln IS NOT INITIAL.
    READ TABLE it_ekko WITH KEY ebeln = idata-ebeln
                                bukrs = idata-bukrs_r.
    MODIFY idata.
  ENDLOOP.
I'm getting this error:
The internal table IT_EKKO has no header line - explicit specification of an output area with INOT wa or ASSIGNING <fs> is required.
I don't see what I'm doing wrong. Please advise.
Thanks in advance.
Ol Pom.

Answer 1

Hi Ol Pom
  What Neil was pointing to is highlighted below. Please check the same to have some understanding.
<b>Current Logic</b>:
SELECT ebeln bukrs
   FROM ekko
   INTO TABLE it_ekko
   FOR ALL ENTRIES IN idata
   WHERE ebeln = idata-vbeln_p.
LOOP AT idata WHERE ebeln IS NOT INITIAL.
     READ TABLE it_ekko WITH KEY ebeln = idata-ebeln
     bukrs = idata-bukrs_r.
     MODIFY idata.
ENDLOOP.
--> Nowhere between the loop and end, any data of
internal table <b>idata</b> is modified, hence the
statement MODIFY IDATA doesnt make any modifications.
For avoiding the syntax error, declare a work area of
type IT_EKKO or declare IT_EKKO with header line.
Options to do the same:
data: wa_ekko like it_ekko.
<b>OR</b>
data: begin of it_ekko <b>occurs 0</b>,
      end of it_ekko.
Above will rectify the syntax error.
Please see that your code resembles something like below:
data: wa_ekko like it_ekko.
IF NOT it_ekko[] is INITIAL.
   SELECT ebeln bukrs
     FROM ekko
     INTO TABLE it_ekko
     FOR ALL ENTRIES IN idata
     WHERE ebeln = idata-vbeln_p.
ENDIF.
LOOP AT idata WHERE ebeln IS NOT INITIAL.
     READ TABLE it_ekko into it_ekko
          WITH KEY ebeln = idata-ebeln
                   bukrs = idata-bukrs_r.
     check sy-subrc eq 0.
*     ... change contents of idata w.r.t it_ekko.
     MODIFY idata.
ENDLOOP.
Kind Regards
Eswar