ABAP Select data from SAP table PKKUM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PKKUM 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 PKKUM. 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 PKKUM 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_PKKUM TYPE STANDARD TABLE OF PKKUM,
      WA_PKKUM TYPE PKKUM,
      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: <PKKUM> TYPE PKKUM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PKKUM
*  INTO TABLE @DATA(IT_PKKUM2).
*--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_PKKUM INDEX 1 INTO DATA(WA_PKKUM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PKKUM>-MNG01 = 1.
<PKKUM>-DAT00 = 1.
<PKKUM>-PKBST = 1.
<PKKUM>-PLNUM = 1.
<PKKUM>-AUFNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PKKUM-POSNR, sy-vline,
  WA_PKKUM-BSTYP, sy-vline,
  WA_PKKUM-EBELN, sy-vline,
  WA_PKKUM-EBELP, sy-vline,
  WA_PKKUM-ETENR, sy-vline,
  WA_PKKUM-RSNUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PKKUM 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_PKKUM 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_PKKUM INTO WA_PKKUM.


*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 PLNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PKKUM-PLNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PKKUM-PLNUM.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit NUMCV, internal->external for field ZPUNKT
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_PKKUM-ZPUNKT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PKKUM-ZPUNKT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPH0, internal->external for field EWM_TANUM
CALL FUNCTION 'CONVERSION_EXIT_ALPH0_OUTPUT'
  EXPORTING
    input =                      WA_PKKUM-EWM_TANUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PKKUM-EWM_TANUM.
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_PKKUM_STR, 
MNG01 TYPE STRING,
DAT00 TYPE STRING,
PKBST TYPE STRING,
PLNUM TYPE STRING,
AUFNR TYPE STRING,
POSNR TYPE STRING,
BSTYP TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
ETENR TYPE STRING,
RSNUM TYPE STRING,
RSPOS TYPE STRING,
TBNUM TYPE STRING,
XCODE TYPE STRING,
KONNR TYPE STRING,
KONTP TYPE STRING,
BSART TYPE STRING,
UMWRK TYPE STRING,
PEDTR TYPE STRING,
LIFNR TYPE STRING,
PSTYP TYPE STRING,
PKBMG TYPE STRING,
PKLKZ TYPE STRING,
PABNUM TYPE STRING,
PABPOS TYPE STRING,
ETENS TYPE STRING,
ZPUNKT TYPE STRING,
VBELN TYPE STRING,
VBELP TYPE STRING,
EWM_LGNUM TYPE STRING,
EWM_TANUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PKKUM_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_PKKUM_STR-MNG01 sy-vline 
WA_PKKUM_STR-DAT00 sy-vline 
WA_PKKUM_STR-PKBST sy-vline 
WA_PKKUM_STR-PLNUM sy-vline 
WA_PKKUM_STR-AUFNR sy-vline 
WA_PKKUM_STR-POSNR sy-vline 
WA_PKKUM_STR-BSTYP sy-vline 
WA_PKKUM_STR-EBELN sy-vline 
WA_PKKUM_STR-EBELP sy-vline 
WA_PKKUM_STR-ETENR sy-vline 
WA_PKKUM_STR-RSNUM sy-vline 
WA_PKKUM_STR-RSPOS sy-vline 
WA_PKKUM_STR-TBNUM sy-vline 
WA_PKKUM_STR-XCODE sy-vline 
WA_PKKUM_STR-KONNR sy-vline 
WA_PKKUM_STR-KONTP sy-vline 
WA_PKKUM_STR-BSART sy-vline 
WA_PKKUM_STR-UMWRK sy-vline 
WA_PKKUM_STR-PEDTR sy-vline 
WA_PKKUM_STR-LIFNR sy-vline 
WA_PKKUM_STR-PSTYP sy-vline 
WA_PKKUM_STR-PKBMG sy-vline 
WA_PKKUM_STR-PKLKZ sy-vline 
WA_PKKUM_STR-PABNUM sy-vline 
WA_PKKUM_STR-PABPOS sy-vline 
WA_PKKUM_STR-ETENS sy-vline 
WA_PKKUM_STR-ZPUNKT sy-vline 
WA_PKKUM_STR-VBELN sy-vline 
WA_PKKUM_STR-VBELP sy-vline 
WA_PKKUM_STR-EWM_LGNUM sy-vline 
WA_PKKUM_STR-EWM_TANUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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