Query error

Gooddays experts, I found thisquery that joinsthreetables,

SELECT a~BUDAT AS BUDAT a~BWART AS BWART a~AUFNR AS AUFNR
          b~ftrmi AS ftrmi b~stlnr AS stlnr
          c~matnr AS matnr c~werks AS werks
   INTO CORRESPONDING FIELDS OF TABLE gt_result
   FROM AUFM AS a INNER JOIN afko AS b ON a~aufnr = b~aufnr
     INNER JOIN resb AS c ON b~aufnr = c~aufnr
     WHERE a~AUFNR IN SO_AUFNR.

Thisquery is delayed,so i decided todo the following

SELECT a~BUDAT AS BUDAT a~BWART AS BWART a~AUFNR AS AUFNR
          b~ftrmi AS ftrmi b~stlnr AS stlnr
   INTO CORRESPONDING FIELDS OF TABLE gt_result
   FROM AUFM AS a INNER JOIN afko AS b ON a~aufnr = b~aufnr
     WHERE a~AUFNR IN SO_AUFNR.

IF NOT ti_resb IS INITIAL.
     SELECT matnr aufnr
       FROM resb
       INTO TABLE ti_resb
       FOR ALL ENTRIES IN gt_result
       WHERE aufnr = gt_result-aufnr.
ENDIF.

IF NOT gt_result IS INITIAL.
     LOOP AT gt_result ASSIGNING <fs_data>.
       DATA: l_matnr.
       CLEAR: l_matnr.
             SELECT SINGLE matnr INTO l_matnr FROM resb
               WHERE matnr = <fs_data>-matnr.

               <fs_data>-matnr = l_matnr.
     ENDLOOP.
     DELETE ADJACENT DUPLICATES FROM gt_result COMPARING aufnr.
ENDIF.

I need to getthematerialresb table, do debbugbut not getthe value, please can guidemewhereis mymistake.

Best regards.