Strange select statement behavior in start routine during extraction

Question

Hi, All..
I'm receiving some odd behavior from a select statment being processed in batch mode (specifically, when run in a normal BW extractor - start routine), the select yields no results .. sy-subrc = 4 and target itab is empty.  however, when i run this same select statement in debug, i get sy-subrc = 0 and records are returned!!  I tried putting the select statement in a standard abap program & it came back successfully in both foreground & background.  something is strange when run in the BW extractor process?? anyone familiar with this?? any help is appreciated!!  Thanks!!

Answer 1

Thanks everyone for the comments!
The code is in the start routine from 0BBP_CONF_TD_1 into 0BBP_CON. 
-The select returns records when in debug
-I've tried running it open without the "for all entries" & it still fails in batch
-The select works during the delta but always fails on the initial load
The select is a join:
DATA: BEGIN of t_JOIN1 OCCURS 0,
        CONNUM    LIKE /BI0/ABBP_CON00-BBP_CON_ID,
        CONITEM   LIKE /BI0/ABBP_CON00-BBP_COITEM,
        PONUM     LIKE /BI0/ABBP_PO00-BBP_PO_ID,
        POITEM    LIKE /BI0/ABBP_PO00-BBP_POITEM,
        ACGUID    LIKE /BI0/ABBP_PO00-BBP_ACGUID,
        SCNUM     LIKE /BI0/ABBP_SC00-BBP_SC_ID,
        SCITEM    LIKE /BI0/ABBP_SC00-BBP_SCITEM,
        REQSTR    LIKE /BI0/ABBP_SC00-BBP_REQSTR.
DATA: END of t_JOIN1.
         SELECT a~BBP_CON_ID
                a~BBP_COITEM
                a~BBP_PO_ID
                a~BBP_POITEM
                b~BBP_ACGUID
                c~BBP_SC_ID
                c~BBP_SCITEM
                c~BBP_REQSTR
           INTO TABLE t_JOIN1
           FROM /BI0/ABBP_CON00 as a
     INNER JOIN /BI0/ABBP_PO00  as b
             ON aBBP_PO_ID  =  bBBP_PO_ID AND
                aBBP_POITEM =  bBBP_POITEM
     INNER JOIN /BI0/ABBP_SC00  as c
             ON bBBP_SC_ID  =  cBBP_SC_ID
            AND bBBP_SCITEM =  cBBP_SCITEM
            FOR ALL ENTRIES IN  DATA_PACKAGE
          WHERE a~BBP_CON_ID =  DATA_PACKAGE-BBP_CON_ID AND
                a~BBP_COITEM =  DATA_PACKAGE-BBP_COITEM AND
                a~BBP_COITEM <> 0 AND
                b~BBP_ACGUID <> '0000' AND
                c~BBP_SCITEM <> 0.