Zuweisung Zeile 1. Tabelle zu Spalte 2. Tabelle

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assign compoment sy-index of structure gs_output to <fs_field> 

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read table gt_description assigning <descr> with key fieldname = <fs_field>.

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append initial line to gt_output assiging <output>
assign component (<fs_field>) to <fs>. 
<fs> = <descr>-bezeichnung.

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data: begin of gt_output,
         kunnr type kunnr,
         matnr type matnr, 
         vbeln  type vbeln,
         posnr type posnr, 
.....                                      "insgesamt 66 Felder
end of gt_output. 

*Aufbau Tabelle Bezeichnung ( Pflegetabelle angelegt)
data: begin of gt_descr
           feldname     type feldname
           bezeichnung type scrltxt_l
       end of gt_descr.

* Inhalt Tabelle gt_output:
123456;4711;9872511;00010;VX;.....

* Inhalt Tabelle gt_descr
KUNNR; Kunde
MATNR; Material
VBELN; Rechnung
.......

* Ausgabe nach Zusammenführung:
Kunde; Material; Rechnung...
123456;4711;9872511.....

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*# get fieldnames of table gt_outputdl
    go_struct ?= cl_abap_structdescr=>describe_by_data( gt_outputdl ).

    CLEAR: gs_outputdl.

    LOOP AT go_struct->components ASSIGNING <comp>.

*# read table zsovost0001 to get header description
      READ TABLE gt_zsovost0001 ASSIGNING <zsovost0001> WITH KEY field = <comp>-name.

      IF sy-subrc = 0 AND
         <zsovost0001> IS ASSIGNED.
*# add header description to structure gs_outputdl
        ASSIGN COMPONENT <comp>-name OF STRUCTURE gs_outputdl TO <fs_field>.
        <fs_field> = <zsovost0001>-scrtext_l.
      ENDIF.
    ENDLOOP.

*# insert header description to table gt_outputdl
    INSERT gs_outputdl INTO gt_outputdl INDEX 1.