ABAP Select data from SAP table ETACCOUNTINGDOCUMENTITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ETACCOUNTINGDOCUMENTITEM
*  INTO TABLE @DATA(IT_ETACCOUNTINGDOCUMENTITEM2).
*--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_ETACCOUNTINGDOCUMENTITEM INDEX 1 INTO DATA(WA_ETACCOUNTINGDOCUMENTITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ETACCOUNTINGDOCUMENTITEM>-REFERENCEDOCUMENTFISCALYEAR = 1.
<ETACCOUNTINGDOCUMENTITEM>-REFERENCEDOCUMENTID = 1.
<ETACCOUNTINGDOCUMENTITEM>-REFERENCEDOCUMENTLOGICALSYSTEM = 1.
<ETACCOUNTINGDOCUMENTITEM>-CHANGEDBYUSERNAME = 1.
<ETACCOUNTINGDOCUMENTITEM>-POSTINGTEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ETACCOUNTINGDOCUMENTITEM-COMPANYCODE, sy-vline,
  WA_ETACCOUNTINGDOCUMENTITEM-ACCOUNTINGDOCUMENT, sy-vline,
  WA_ETACCOUNTINGDOCUMENTITEM-POSTINGYEAR, sy-vline,
  WA_ETACCOUNTINGDOCUMENTITEM-JOURNALENTRYCREATIONDATE, sy-vline,
  WA_ETACCOUNTINGDOCUMENTITEM-POSTINGDATE, sy-vline,
  WA_ETACCOUNTINGDOCUMENTITEM-TRANSACTIONDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ETACCOUNTINGDOCUMENTITEM 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_ETACCOUNTINGDOCUMENTITEM 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_ETACCOUNTINGDOCUMENTITEM INTO WA_ETACCOUNTINGDOCUMENTITEM.


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

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field UNITOFMEASURE
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ETACCOUNTINGDOCUMENTITEM-UNITOFMEASURE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ETACCOUNTINGDOCUMENTITEM-UNITOFMEASURE.
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_ETACCOUNTINGDOCUMENTITEM_STR, 
REFERENCEDOCUMENTFISCALYEAR TYPE STRING,
REFERENCEDOCUMENTID TYPE STRING,
REFERENCEDOCUMENTLOGICALSYSTEM TYPE STRING,
CHANGEDBYUSERNAME TYPE STRING,
POSTINGTEXT TYPE STRING,
COMPANYCODE TYPE STRING,
ACCOUNTINGDOCUMENT TYPE STRING,
POSTINGYEAR TYPE STRING,
JOURNALENTRYCREATIONDATE TYPE STRING,
POSTINGDATE TYPE STRING,
TRANSACTIONDATE TYPE STRING,
GLACCOUNTNODEBIT TYPE STRING,
GLACCOUNTNOCREDIT TYPE STRING,
JOURNALENTRYITEMTEXT TYPE STRING,
TRANSACTIONCURRENCY TYPE STRING,
TRANSACTIONCURRENCYISOCODE TYPE STRING,
AMOUNTINTRANSACTIONCURRENCY TYPE STRING,
PLANT TYPE STRING,
QUANTITY TYPE STRING,
UNITOFMEASURE TYPE STRING,
UNITOFMEASUREISOCODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ETACCOUNTINGDOCUMENTITEM_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_ETACCOUNTINGDOCUMENTITEM_STR-REFERENCEDOCUMENTFISCALYEAR sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-REFERENCEDOCUMENTID sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-REFERENCEDOCUMENTLOGICALSYSTEM sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-CHANGEDBYUSERNAME sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-POSTINGTEXT sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-COMPANYCODE sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-ACCOUNTINGDOCUMENT sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-POSTINGYEAR sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-JOURNALENTRYCREATIONDATE sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-POSTINGDATE sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-TRANSACTIONDATE sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-GLACCOUNTNODEBIT sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-GLACCOUNTNOCREDIT sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-JOURNALENTRYITEMTEXT sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-TRANSACTIONCURRENCY sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-TRANSACTIONCURRENCYISOCODE sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-AMOUNTINTRANSACTIONCURRENCY sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-PLANT sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-QUANTITY sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-UNITOFMEASURE sy-vline 
WA_ETACCOUNTINGDOCUMENTITEM_STR-UNITOFMEASUREISOCODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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