ABAP Select data from SAP table GST_IN_GL_ACCOUNT_ITEM 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_GL_ACCOUNT_ITEM 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_GL_ACCOUNT_ITEM. 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_GL_ACCOUNT_ITEM 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_GL_ACCOUNT_ITEM TYPE STANDARD TABLE OF GST_IN_GL_ACCOUNT_ITEM,
      WA_GST_IN_GL_ACCOUNT_ITEM TYPE GST_IN_GL_ACCOUNT_ITEM,
      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_GL_ACCOUNT_ITEM> TYPE GST_IN_GL_ACCOUNT_ITEM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GST_IN_GL_ACCOUNT_ITEM
*  INTO TABLE @DATA(IT_GST_IN_GL_ACCOUNT_ITEM2).
*--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_GL_ACCOUNT_ITEM INDEX 1 INTO DATA(WA_GST_IN_GL_ACCOUNT_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GST_IN_GL_ACCOUNT_ITEM>-ACCOUNTINGDOCUMENTITEMREF = 1.
<GST_IN_GL_ACCOUNT_ITEM>-GLACCOUNT = 1.
<GST_IN_GL_ACCOUNT_ITEM>-DOCUMENTITEMTEXT = 1.
<GST_IN_GL_ACCOUNT_ITEM>-ACCOUNTINGDOCUMENT = 1.
<GST_IN_GL_ACCOUNT_ITEM>-TRANSACTIONTYPEDETERMINATION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GST_IN_GL_ACCOUNT_ITEM-FINANCIALACCOUNTTYPE, sy-vline,
  WA_GST_IN_GL_ACCOUNT_ITEM-ACCOUNTINGDOCUMENTTYPE, sy-vline,
  WA_GST_IN_GL_ACCOUNT_ITEM-COMPANYCODE, sy-vline,
  WA_GST_IN_GL_ACCOUNT_ITEM-BUSINESSAREA, sy-vline,
  WA_GST_IN_GL_ACCOUNT_ITEM-PLANT, sy-vline,
  WA_GST_IN_GL_ACCOUNT_ITEM-FISCALPERIOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GST_IN_GL_ACCOUNT_ITEM 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_GL_ACCOUNT_ITEM 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_GL_ACCOUNT_ITEM INTO WA_GST_IN_GL_ACCOUNT_ITEM.


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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field PROFITCENTER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GST_IN_GL_ACCOUNT_ITEM-PROFITCENTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GST_IN_GL_ACCOUNT_ITEM-PROFITCENTER.
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_GL_ACCOUNT_ITEM_STR, 
ACCOUNTINGDOCUMENTITEMREF TYPE STRING,
GLACCOUNT TYPE STRING,
DOCUMENTITEMTEXT TYPE STRING,
ACCOUNTINGDOCUMENT TYPE STRING,
TRANSACTIONTYPEDETERMINATION TYPE STRING,
FINANCIALACCOUNTTYPE TYPE STRING,
ACCOUNTINGDOCUMENTTYPE TYPE STRING,
COMPANYCODE TYPE STRING,
BUSINESSAREA TYPE STRING,
PLANT TYPE STRING,
FISCALPERIOD TYPE STRING,
FISCALYEAR TYPE STRING,
POSTINGDATE TYPE STRING,
CUSTOMER TYPE STRING,
SUPPLIER TYPE STRING,
TAXCODE TYPE STRING,
TAXJURISDICTION TYPE STRING,
COSTOBJECT TYPE STRING,
COSTCENTER TYPE STRING,
COSTCTRACTIVITYTYPE TYPE STRING,
PROFITCENTER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GST_IN_GL_ACCOUNT_ITEM_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_GL_ACCOUNT_ITEM_STR-ACCOUNTINGDOCUMENTITEMREF sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-GLACCOUNT sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-DOCUMENTITEMTEXT sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-ACCOUNTINGDOCUMENT sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-TRANSACTIONTYPEDETERMINATION sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-FINANCIALACCOUNTTYPE sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-ACCOUNTINGDOCUMENTTYPE sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-COMPANYCODE sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-BUSINESSAREA sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-PLANT sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-FISCALPERIOD sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-FISCALYEAR sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-POSTINGDATE sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-CUSTOMER sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-SUPPLIER sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-TAXCODE sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-TAXJURISDICTION sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-COSTOBJECT sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-COSTCENTER sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-COSTCTRACTIVITYTYPE sy-vline 
WA_GST_IN_GL_ACCOUNT_ITEM_STR-PROFITCENTER sy-vline      INTO ld_text SEPARATED BY SPACE.

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