ABAP Select data from SAP table GTCN_S_TR_EXPORT_INV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GTCN_S_TR_EXPORT_INV
*  INTO TABLE @DATA(IT_GTCN_S_TR_EXPORT_INV2).
*--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_GTCN_S_TR_EXPORT_INV INDEX 1 INTO DATA(WA_GTCN_S_TR_EXPORT_INV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GTCN_S_TR_EXPORT_INV>-VBELN = 1.
<GTCN_S_TR_EXPORT_INV>-POSNR = 1.
<GTCN_S_TR_EXPORT_INV>-VBTYP = 1.
<GTCN_S_TR_EXPORT_INV>-INVOICE_QTY = 1.
<GTCN_S_TR_EXPORT_INV>-MEINS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GTCN_S_TR_EXPORT_INV-INVOICED_QTY_BUOM, sy-vline,
  WA_GTCN_S_TR_EXPORT_INV-MEINS_BUOM, sy-vline,
  WA_GTCN_S_TR_EXPORT_INV-CURRENCY, sy-vline,
  WA_GTCN_S_TR_EXPORT_INV-KUNNR, sy-vline,
  WA_GTCN_S_TR_EXPORT_INV-NETWR, sy-vline,
  WA_GTCN_S_TR_EXPORT_INV-MATNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GTCN_S_TR_EXPORT_INV 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_GTCN_S_TR_EXPORT_INV 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_GTCN_S_TR_EXPORT_INV INTO WA_GTCN_S_TR_EXPORT_INV.


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

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

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_GTCN_S_TR_EXPORT_INV-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTCN_S_TR_EXPORT_INV-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field KURRF
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_GTCN_S_TR_EXPORT_INV-KURRF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTCN_S_TR_EXPORT_INV-KURRF.
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_GTCN_S_TR_EXPORT_INV_STR, 
VBELN TYPE STRING,
POSNR TYPE STRING,
VBTYP TYPE STRING,
INVOICE_QTY TYPE STRING,
MEINS TYPE STRING,
INVOICED_QTY_BUOM TYPE STRING,
MEINS_BUOM TYPE STRING,
CURRENCY TYPE STRING,
KUNNR TYPE STRING,
NETWR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
SPART TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
INVOICE_DATE TYPE STRING,
KNUMV TYPE STRING,
KURRF TYPE STRING,
MATCHED_FLAG TYPE STRING,
REMAINING_QTY TYPE STRING,
VAT_REFUND_RATE TYPE STRING,
VAT_REFUND_AMT TYPE STRING,
CT_REFUND_RATE TYPE STRING,
CT_REFUND_AMT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GTCN_S_TR_EXPORT_INV_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_GTCN_S_TR_EXPORT_INV_STR-VBELN sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-POSNR sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-VBTYP sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-INVOICE_QTY sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-MEINS sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-INVOICED_QTY_BUOM sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-MEINS_BUOM sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-CURRENCY sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-KUNNR sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-NETWR sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-MATNR sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-WERKS sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-SPART sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-LGORT sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-CHARG sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-INVOICE_DATE sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-KNUMV sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-KURRF sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-MATCHED_FLAG sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-REMAINING_QTY sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-VAT_REFUND_RATE sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-VAT_REFUND_AMT sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-CT_REFUND_RATE sy-vline 
WA_GTCN_S_TR_EXPORT_INV_STR-CT_REFUND_AMT sy-vline      INTO ld_text SEPARATED BY SPACE.

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