ABAP Select data from SAP table WZRE_S_POSTING_ITEM_INPUT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WZRE_S_POSTING_ITEM_INPUT
*  INTO TABLE @DATA(IT_WZRE_S_POSTING_ITEM_INPUT2).
*--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_WZRE_S_POSTING_ITEM_INPUT INDEX 1 INTO DATA(WA_WZRE_S_POSTING_ITEM_INPUT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WZRE_S_POSTING_ITEM_INPUT>-OLDPO = 1.
<WZRE_S_POSTING_ITEM_INPUT>-QUANTITY = 1.
<WZRE_S_POSTING_ITEM_INPUT>-UNIT = 1.
<WZRE_S_POSTING_ITEM_INPUT>-REF_DOC_TYPE = 1.
<WZRE_S_POSTING_ITEM_INPUT>-REF_DOC_NO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WZRE_S_POSTING_ITEM_INPUT-REF_YEAR, sy-vline,
  WA_WZRE_S_POSTING_ITEM_INPUT-REF_ITEM, sy-vline,
  WA_WZRE_S_POSTING_ITEM_INPUT-PRED_REF_DOC_TYPE, sy-vline,
  WA_WZRE_S_POSTING_ITEM_INPUT-PRED_REF_DOC_NO, sy-vline,
  WA_WZRE_S_POSTING_ITEM_INPUT-PRED_REF_YEAR, sy-vline,
  WA_WZRE_S_POSTING_ITEM_INPUT-PRED_REF_ITEM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WZRE_S_POSTING_ITEM_INPUT 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_WZRE_S_POSTING_ITEM_INPUT 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_WZRE_S_POSTING_ITEM_INPUT INTO WA_WZRE_S_POSTING_ITEM_INPUT.


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

*Conversion exit GJAHR, internal->external for field REF_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WZRE_S_POSTING_ITEM_INPUT-REF_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WZRE_S_POSTING_ITEM_INPUT-REF_YEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field PRED_REF_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WZRE_S_POSTING_ITEM_INPUT-PRED_REF_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WZRE_S_POSTING_ITEM_INPUT-PRED_REF_YEAR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field EXT_REF_LOGSYS2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WZRE_S_POSTING_ITEM_INPUT-EXT_REF_LOGSYS2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WZRE_S_POSTING_ITEM_INPUT-EXT_REF_LOGSYS2.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit EXCRT, internal->external for field EXCHANGE_RATE
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_WZRE_S_POSTING_ITEM_INPUT-EXCHANGE_RATE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WZRE_S_POSTING_ITEM_INPUT-EXCHANGE_RATE.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WZRE_S_POSTING_ITEM_INPUT-CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WZRE_S_POSTING_ITEM_INPUT-CUSTOMER.
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_WZRE_S_POSTING_ITEM_INPUT_STR, 
OLDPO TYPE STRING,
QUANTITY TYPE STRING,
UNIT TYPE STRING,
REF_DOC_TYPE TYPE STRING,
REF_DOC_NO TYPE STRING,
REF_YEAR TYPE STRING,
REF_ITEM TYPE STRING,
PRED_REF_DOC_TYPE TYPE STRING,
PRED_REF_DOC_NO TYPE STRING,
PRED_REF_YEAR TYPE STRING,
PRED_REF_ITEM TYPE STRING,
EXT_REF_DOC_TYPE TYPE STRING,
EXT_REF_DOC_NO TYPE STRING,
EXT_REF_ITEM TYPE STRING,
EXT_REF_LOGSYS TYPE STRING,
EXT_REF_DOC_TYPE2 TYPE STRING,
EXT_REF_DOC_NO2 TYPE STRING,
EXT_REF_ITEM2 TYPE STRING,
EXT_REF_LOGSYS2 TYPE STRING,
CONTRACT TYPE STRING,
CONTRACT_ITEM TYPE STRING,
CONTRACT_TYPE TYPE STRING,
ITEMCAT TYPE STRING,
CURR TYPE STRING,
LOCAL_CURR_EXT TYPE STRING,
EXCHANGE_RATE TYPE STRING,
EXCHANGE_RATE_TYPE TYPE STRING,
SALES_ORG TYPE STRING,
DISTR_CHANNNEL TYPE STRING,
DIVISION TYPE STRING,
PURCH_ORG TYPE STRING,
PURCH_GRP TYPE STRING,
VENDOR TYPE STRING,
CUSTOMER TYPE STRING,
COMP_CODE TYPE STRING,
INPUT_TAX TYPE STRING,
PERSON_NO TYPE STRING,
OUTPUT_TAX TYPE STRING,
DATA_CONTAINER TYPE STRING,
POSTING_DATE TYPE STRING,
DUMMY_HE TYPE STRING,
DUMMY_IE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WZRE_S_POSTING_ITEM_INPUT_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_WZRE_S_POSTING_ITEM_INPUT_STR-OLDPO sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-QUANTITY sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-UNIT sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-REF_DOC_TYPE sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-REF_DOC_NO sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-REF_YEAR sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-REF_ITEM sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-PRED_REF_DOC_TYPE sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-PRED_REF_DOC_NO sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-PRED_REF_YEAR sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-PRED_REF_ITEM sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-EXT_REF_DOC_TYPE sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-EXT_REF_DOC_NO sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-EXT_REF_ITEM sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-EXT_REF_LOGSYS sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-EXT_REF_DOC_TYPE2 sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-EXT_REF_DOC_NO2 sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-EXT_REF_ITEM2 sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-EXT_REF_LOGSYS2 sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-CONTRACT sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-CONTRACT_ITEM sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-CONTRACT_TYPE sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-ITEMCAT sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-CURR sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-LOCAL_CURR_EXT sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-EXCHANGE_RATE sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-EXCHANGE_RATE_TYPE sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-SALES_ORG sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-DISTR_CHANNNEL sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-DIVISION sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-PURCH_ORG sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-PURCH_GRP sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-VENDOR sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-CUSTOMER sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-COMP_CODE sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-INPUT_TAX sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-PERSON_NO sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-OUTPUT_TAX sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-DATA_CONTAINER sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-POSTING_DATE sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-DUMMY_HE sy-vline 
WA_WZRE_S_POSTING_ITEM_INPUT_STR-DUMMY_IE sy-vline      INTO ld_text SEPARATED BY SPACE.

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