ABAP Select data from SAP table GST_IN_ACC_HEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GST_IN_ACC_HEADER
*  INTO TABLE @DATA(IT_GST_IN_ACC_HEADER2).
*--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_GST_IN_ACC_HEADER INDEX 1 INTO DATA(WA_GST_IN_ACC_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GST_IN_ACC_HEADER>-REFERENCEDOCUMENTTYPE = 1.
<GST_IN_ACC_HEADER>-ORIGINALREFERENCEDOCUMENT = 1.
<GST_IN_ACC_HEADER>-LOGICALSYSTEM = 1.
<GST_IN_ACC_HEADER>-BUSINESSTRANSACTIONTYPE = 1.
<GST_IN_ACC_HEADER>-ACCOUNTINGDOCCREATEDBYUSER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GST_IN_ACC_HEADER-ACCOUNTINGDOCUMENTHEADERTEXT, sy-vline,
  WA_GST_IN_ACC_HEADER-COMPANYCODE, sy-vline,
  WA_GST_IN_ACC_HEADER-DOCUMENTDATE, sy-vline,
  WA_GST_IN_ACC_HEADER-POSTINGDATE, sy-vline,
  WA_GST_IN_ACC_HEADER-EXCHANGERATEDATE, sy-vline,
  WA_GST_IN_ACC_HEADER-FISCALYEAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GST_IN_ACC_HEADER 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_GST_IN_ACC_HEADER 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_GST_IN_ACC_HEADER INTO WA_GST_IN_ACC_HEADER.


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

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

*Conversion exit ALPHA, internal->external for field ACCOUNTINGDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GST_IN_ACC_HEADER-ACCOUNTINGDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GST_IN_ACC_HEADER-ACCOUNTINGDOCUMENT.
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_GST_IN_ACC_HEADER_STR, 
REFERENCEDOCUMENTTYPE TYPE STRING,
ORIGINALREFERENCEDOCUMENT TYPE STRING,
LOGICALSYSTEM TYPE STRING,
BUSINESSTRANSACTIONTYPE TYPE STRING,
ACCOUNTINGDOCCREATEDBYUSER TYPE STRING,
ACCOUNTINGDOCUMENTHEADERTEXT TYPE STRING,
COMPANYCODE TYPE STRING,
DOCUMENTDATE TYPE STRING,
POSTINGDATE TYPE STRING,
EXCHANGERATEDATE TYPE STRING,
FISCALYEAR TYPE STRING,
FISCALPERIOD TYPE STRING,
ACCOUNTINGDOCUMENTTYPE TYPE STRING,
DOCUMENTREFERENCEID TYPE STRING,
ACCOUNTINGDOCUMENT TYPE STRING,
REVERSALREASON TYPE STRING,
TAXREPORTINGDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GST_IN_ACC_HEADER_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_GST_IN_ACC_HEADER_STR-REFERENCEDOCUMENTTYPE sy-vline 
WA_GST_IN_ACC_HEADER_STR-ORIGINALREFERENCEDOCUMENT sy-vline 
WA_GST_IN_ACC_HEADER_STR-LOGICALSYSTEM sy-vline 
WA_GST_IN_ACC_HEADER_STR-BUSINESSTRANSACTIONTYPE sy-vline 
WA_GST_IN_ACC_HEADER_STR-ACCOUNTINGDOCCREATEDBYUSER sy-vline 
WA_GST_IN_ACC_HEADER_STR-ACCOUNTINGDOCUMENTHEADERTEXT sy-vline 
WA_GST_IN_ACC_HEADER_STR-COMPANYCODE sy-vline 
WA_GST_IN_ACC_HEADER_STR-DOCUMENTDATE sy-vline 
WA_GST_IN_ACC_HEADER_STR-POSTINGDATE sy-vline 
WA_GST_IN_ACC_HEADER_STR-EXCHANGERATEDATE sy-vline 
WA_GST_IN_ACC_HEADER_STR-FISCALYEAR sy-vline 
WA_GST_IN_ACC_HEADER_STR-FISCALPERIOD sy-vline 
WA_GST_IN_ACC_HEADER_STR-ACCOUNTINGDOCUMENTTYPE sy-vline 
WA_GST_IN_ACC_HEADER_STR-DOCUMENTREFERENCEID sy-vline 
WA_GST_IN_ACC_HEADER_STR-ACCOUNTINGDOCUMENT sy-vline 
WA_GST_IN_ACC_HEADER_STR-REVERSALREASON sy-vline 
WA_GST_IN_ACC_HEADER_STR-TAXREPORTINGDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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