Unable to fill data in Structure

Question

Hello,
i am new to ABAP, started learning a week ago. i am trying to create a structure with 3 fields from two sap tables. Later, i need to fetch data from sap table to populate the structure and display. i am getting an error like "workarea does not contain corresponding components" and when i execute data will be populated in structure but the number of rows is shown (number of rows is 20 but all blank values) i write my code as follows.
TABLES vbak.
TABLES vbap.
SELECT-OPTIONS: so_vbeln FOR vbap-vbeln.
TYPES: BEGIN OF ty_item,
   salesdoch TYPE vbak-vbeln,
   salesdoci TYPE vbap-vbeln,
   materno TYPE vbap-matnr,
   END OF ty_item.
DATA: gt_vbak TYPE STANDARD TABLE OF vbak,
       gs_vbak TYPE vbak,
       gt_vbap TYPE STANDARD TABLE OF vbap,
       gs_vbap TYPE vbap,
       gt_item TYPE STANDARD TABLE OF ty_item,
       gs_item TYPE ty_item.
SELECT vbeln FROM vbak INTO CORRESPONDING FIELDS OF TABLE gt_vbak
   WHERE vbeln IN so_vbeln.
IF gt_vbak IS NOT INITIAL.
   SELECT vbeln matnr FROM vbap INTO CORRESPONDING FIELDS OF TABLE gt_item
     FOR ALL ENTRIES IN gt_vbak
     WHERE vbeln EQ gt_vbak-vbeln.
ENDIF.
LOOP AT gt_item INTO gs_item.
   WRITE: gs_item-salesdoci.
ENDLOOP.
can you please help me how can i fix this issue.

Answer 1

Hi Prasad,
In below query your are retrieving data from field VBELN and MATNR of table VBAP, but if you check structure of internal table gt_item, its filds are salesdoch,  salesdoci,
materno . So system gets confused as in which fields of iternal table gt_item it has to place the records.
   SELECT vbeln matnr FROM vbap INTO CORRESPONDING FIELDS OF TABLE gt_item
     FOR ALL ENTRIES IN gt_vbak
     WHERE vbeln EQ gt_vbak-vbeln.
To resolve above issue you need to mention VBLEN, POSNR and MATNR instead of
   salesdoch,  salesdoci,  materno fields in structure  ty_item.
Thanks & Regards,
Padmakar Kudtarkar