ABAP Select data from SAP table VWAKP into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VWAKP table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to VWAKP. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the VWAKP table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_VWAKP TYPE STANDARD TABLE OF VWAKP,
      WA_VWAKP TYPE VWAKP,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <VWAKP> TYPE VWAKP.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VWAKP.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VWAKP
  INTO TABLE IT_VWAKP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VWAKP
*  INTO TABLE @DATA(IT_VWAKP2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_VWAKP INDEX 1 INTO DATA(WA_VWAKP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VWAKP ASSIGNING <VWAKP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VWAKP>-MANDT = 1.
<VWAKP>-AKTNR = 1.
<VWAKP>-ARTNR = 1.
<VWAKP>-MEBME = 1.
<VWAKP>-AKPOS = 1.

ENDLOOP.

LOOP AT IT_VWAKP INTO WA_VWAKP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VWAKP-SATNR, sy-vline,
  WA_VWAKP-MATKL, sy-vline,
  WA_VWAKP-AKTHE, sy-vline,
  WA_VWAKP-BZQFI, sy-vline,
  WA_VWAKP-AKBSP, sy-vline,
  WA_VWAKP-NBPOS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VWAKP you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_VWAKP TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_VWAKP INTO WA_VWAKP.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field AKTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-AKTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-AKTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field ARTNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-ARTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-ARTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEBME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-MEBME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-MEBME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field SATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-SATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-SATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MELOG
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-MELOG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-MELOG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEBPR
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-MEBPR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-MEBPR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEAUF
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-MEAUF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-MEAUF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VREGE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-VREGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-VREGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-ABELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-ABELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field BATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-BATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-BATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OFFER_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-OFFER_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-OFFER_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OFFER_ID_DSC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWAKP-OFFER_ID_DSC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWAKP-OFFER_ID_DSC.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_VWAKP_STR, 
MANDT TYPE STRING,
AKTNR TYPE STRING,
ARTNR TYPE STRING,
MEBME TYPE STRING,
AKPOS TYPE STRING,
SATNR TYPE STRING,
MATKL TYPE STRING,
AKTHE TYPE STRING,
BZQFI TYPE STRING,
AKBSP TYPE STRING,
NBPOS TYPE STRING,
RESKZ TYPE STRING,
BEKTY TYPE STRING,
SPDAT TYPE STRING,
SPGRU TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
AKLIZ TYPE STRING,
PUMVP TYPE STRING,
PUMEP TYPE STRING,
PUMEN TYPE STRING,
PABBM TYPE STRING,
PABLM TYPE STRING,
AUFME TYPE STRING,
PLVKP TYPE STRING,
VPEIN TYPE STRING,
PLEKP TYPE STRING,
PLEKN TYPE STRING,
EPEIN TYPE STRING,
WAEEK TYPE STRING,
WAELA TYPE STRING,
MEINS TYPE STRING,
MELOG TYPE STRING,
MEBPR TYPE STRING,
MEAUF TYPE STRING,
RGART TYPE STRING,
MIAMG TYPE STRING,
NDISP TYPE STRING,
FBDAT TYPE STRING,
SBDAT TYPE STRING,
FLDAT TYPE STRING,
SLDAT TYPE STRING,
APSTP TYPE STRING,
BEDAT TYPE STRING,
VREGE TYPE STRING,
ABELN TYPE STRING,
ABELP TYPE STRING,
ETIAG TYPE STRING,
EKKPS TYPE STRING,
VKKPS TYPE STRING,
EKKON TYPE STRING,
VKKON TYPE STRING,
ACTIV TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
ECKPKZ TYPE STRING,
VZKON TYPE STRING,
VZKPS TYPE STRING,
EPRGR TYPE STRING,
NVKP TYPE STRING,
VK_AKTIV_AB TYPE STRING,
VK_AKTIV_BI TYPE STRING,
BATNR TYPE STRING,
EKERV TYPE STRING,
REB_VALUE TYPE STRING,
REB_PERC TYPE STRING,
REB_STATUS TYPE STRING,
NO_KALK TYPE STRING,
ASTRA TYPE STRING,
OFFER_TYPE TYPE STRING,
OFFER_TYPE_DSC TYPE STRING,
OFFER_ID TYPE STRING,
OFFER_ID_DSC TYPE STRING,
OFFER_PRDGRP TYPE STRING,
OFFER_PRDGRP_DSC TYPE STRING,
ITEM_CREAT_INDIC TYPE STRING,
PABBM_OFFER_PRC TYPE STRING,
PABBM_OFFER_DSC TYPE STRING,
ASTRA_VAR TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VWAKP_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_VWAKP_STR-MANDT sy-vline 
WA_VWAKP_STR-AKTNR sy-vline 
WA_VWAKP_STR-ARTNR sy-vline 
WA_VWAKP_STR-MEBME sy-vline 
WA_VWAKP_STR-AKPOS sy-vline 
WA_VWAKP_STR-SATNR sy-vline 
WA_VWAKP_STR-MATKL sy-vline 
WA_VWAKP_STR-AKTHE sy-vline 
WA_VWAKP_STR-BZQFI sy-vline 
WA_VWAKP_STR-AKBSP sy-vline 
WA_VWAKP_STR-NBPOS sy-vline 
WA_VWAKP_STR-RESKZ sy-vline 
WA_VWAKP_STR-BEKTY sy-vline 
WA_VWAKP_STR-SPDAT sy-vline 
WA_VWAKP_STR-SPGRU sy-vline 
WA_VWAKP_STR-EKORG sy-vline 
WA_VWAKP_STR-EKGRP sy-vline 
WA_VWAKP_STR-VKORG sy-vline 
WA_VWAKP_STR-VTWEG sy-vline 
WA_VWAKP_STR-AKLIZ sy-vline 
WA_VWAKP_STR-PUMVP sy-vline 
WA_VWAKP_STR-PUMEP sy-vline 
WA_VWAKP_STR-PUMEN sy-vline 
WA_VWAKP_STR-PABBM sy-vline 
WA_VWAKP_STR-PABLM sy-vline 
WA_VWAKP_STR-AUFME sy-vline 
WA_VWAKP_STR-PLVKP sy-vline 
WA_VWAKP_STR-VPEIN sy-vline 
WA_VWAKP_STR-PLEKP sy-vline 
WA_VWAKP_STR-PLEKN sy-vline 
WA_VWAKP_STR-EPEIN sy-vline 
WA_VWAKP_STR-WAEEK sy-vline 
WA_VWAKP_STR-WAELA sy-vline 
WA_VWAKP_STR-MEINS sy-vline 
WA_VWAKP_STR-MELOG sy-vline 
WA_VWAKP_STR-MEBPR sy-vline 
WA_VWAKP_STR-MEAUF sy-vline 
WA_VWAKP_STR-RGART sy-vline 
WA_VWAKP_STR-MIAMG sy-vline 
WA_VWAKP_STR-NDISP sy-vline 
WA_VWAKP_STR-FBDAT sy-vline 
WA_VWAKP_STR-SBDAT sy-vline 
WA_VWAKP_STR-FLDAT sy-vline 
WA_VWAKP_STR-SLDAT sy-vline 
WA_VWAKP_STR-APSTP sy-vline 
WA_VWAKP_STR-BEDAT sy-vline 
WA_VWAKP_STR-VREGE sy-vline 
WA_VWAKP_STR-ABELN sy-vline 
WA_VWAKP_STR-ABELP sy-vline 
WA_VWAKP_STR-ETIAG sy-vline 
WA_VWAKP_STR-EKKPS sy-vline 
WA_VWAKP_STR-VKKPS sy-vline 
WA_VWAKP_STR-EKKON sy-vline 
WA_VWAKP_STR-VKKON sy-vline 
WA_VWAKP_STR-ACTIV sy-vline 
WA_VWAKP_STR-ERNAM sy-vline 
WA_VWAKP_STR-ERDAT sy-vline 
WA_VWAKP_STR-AENAM sy-vline 
WA_VWAKP_STR-AEDAT sy-vline 
WA_VWAKP_STR-ECKPKZ sy-vline 
WA_VWAKP_STR-VZKON sy-vline 
WA_VWAKP_STR-VZKPS sy-vline 
WA_VWAKP_STR-EPRGR sy-vline 
WA_VWAKP_STR-NVKP sy-vline 
WA_VWAKP_STR-VK_AKTIV_AB sy-vline 
WA_VWAKP_STR-VK_AKTIV_BI sy-vline 
WA_VWAKP_STR-BATNR sy-vline 
WA_VWAKP_STR-EKERV sy-vline 
WA_VWAKP_STR-REB_VALUE sy-vline 
WA_VWAKP_STR-REB_PERC sy-vline 
WA_VWAKP_STR-REB_STATUS sy-vline 
WA_VWAKP_STR-NO_KALK sy-vline 
WA_VWAKP_STR-ASTRA sy-vline 
WA_VWAKP_STR-OFFER_TYPE sy-vline 
WA_VWAKP_STR-OFFER_TYPE_DSC sy-vline 
WA_VWAKP_STR-OFFER_ID sy-vline 
WA_VWAKP_STR-OFFER_ID_DSC sy-vline 
WA_VWAKP_STR-OFFER_PRDGRP sy-vline 
WA_VWAKP_STR-OFFER_PRDGRP_DSC sy-vline 
WA_VWAKP_STR-ITEM_CREAT_INDIC sy-vline 
WA_VWAKP_STR-PABBM_OFFER_PRC sy-vline 
WA_VWAKP_STR-PABBM_OFFER_DSC sy-vline 
WA_VWAKP_STR-ASTRA_VAR sy-vline 
WA_VWAKP_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.