Inner join searches too many entries

Question

Hi experts,
In a user exit following code is used:
DATA : h_rsnum LIKE afko-rsnum,
       h_charg LIKE resb-charg,
       h_matnr LIKE resb-matnr,
    SELECT SINGLE rsnum INTO h_rsnum
                 FROM afko
                 WHERE aufnr = x_bncom-aufnr.
    IF sy-subrc = 0 .
      SELECT resbcharg resbmatnr
              INTO (h_charg, h_matnr)
              FROM mara INNER JOIN resb
                ON maramatnr = resbmatnr            
                WHERE resb~rsnum = h_rsnum
                AND resb~charg NE space
                AND maramtart = 'HALB' OR maramtart = 'FERT'.     
      ENDSELECT.
Goal of the source code is to detemine the reservation number of a process order. From table RESB with key h_rsnum,  the material nb and the batch nb of the single material with material type HALB or FERT needs to be selected.
During debugging I found out that this code searches into a very long list of materials before ending up with the correct h_charg and h_matnr.
If the condition resb~rsnum = h_rsnum would be taken into account when creating the inner join, the list would only contain 20 materials maximum.
Can this behaviour be changed and how to do it?
Rgds,
Suzy

Answer 1

if this is inside a user exit 1st of all why are you using a select endselect and i dont see you take that in to a table which means your only looking for one record.
about you tell that before the inner join taking the where condition into consideration. I dont think it will be possible sine normally after making the join it should go for the where condition anyway ill try to check on it and see.
sometimes  Siegfried might know an answer dont know if he saw this.
Nafran
Edited by: Nafran Shiraz on Jun 4, 2009 12:36 PM