ABAP Select data from SAP table GTCN_TR_VENDOR_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_TR_VENDOR_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_TR_VENDOR_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_TR_VENDOR_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_TR_VENDOR_INV TYPE STANDARD TABLE OF GTCN_TR_VENDOR_INV,
      WA_GTCN_TR_VENDOR_INV TYPE GTCN_TR_VENDOR_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_TR_VENDOR_INV> TYPE GTCN_TR_VENDOR_INV.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GTCN_TR_VENDOR_INV
*  INTO TABLE @DATA(IT_GTCN_TR_VENDOR_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_TR_VENDOR_INV INDEX 1 INTO DATA(WA_GTCN_TR_VENDOR_INV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GTCN_TR_VENDOR_INV>-BELNR = 1.
<GTCN_TR_VENDOR_INV>-GJAHR = 1.
<GTCN_TR_VENDOR_INV>-BUZEI = 1.
<GTCN_TR_VENDOR_INV>-WRBTR = 1.
<GTCN_TR_VENDOR_INV>-BUKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GTCN_TR_VENDOR_INV-MENGE, sy-vline,
  WA_GTCN_TR_VENDOR_INV-BSTME, sy-vline,
  WA_GTCN_TR_VENDOR_INV-MWSKZ, sy-vline,
  WA_GTCN_TR_VENDOR_INV-WAERS, sy-vline,
  WA_GTCN_TR_VENDOR_INV-BLDAT, sy-vline,
  WA_GTCN_TR_VENDOR_INV-LIFNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GTCN_TR_VENDOR_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_TR_VENDOR_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_TR_VENDOR_INV INTO WA_GTCN_TR_VENDOR_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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GTCN_TR_VENDOR_INV-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTCN_TR_VENDOR_INV-BELNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field REF_DOC_NO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GTCN_TR_VENDOR_INV-REF_DOC_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTCN_TR_VENDOR_INV-REF_DOC_NO.
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_TR_VENDOR_INV_STR, 
BELNR TYPE STRING,
GJAHR TYPE STRING,
BUZEI TYPE STRING,
WRBTR TYPE STRING,
BUKRS TYPE STRING,
MENGE TYPE STRING,
BSTME TYPE STRING,
MWSKZ TYPE STRING,
WAERS TYPE STRING,
BLDAT TYPE STRING,
LIFNR TYPE STRING,
XBLNR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
REF_DOC_NO TYPE STRING,
REF_DOC_ITEM TYPE STRING,
TAX_RATE TYPE STRING,
MATCHED_FLAG TYPE STRING,
REMAINING_QTY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GTCN_TR_VENDOR_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_TR_VENDOR_INV_STR-BELNR sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-GJAHR sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-BUZEI sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-WRBTR sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-BUKRS sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-MENGE sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-BSTME sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-MWSKZ sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-WAERS sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-BLDAT sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-LIFNR sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-XBLNR sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-MATNR sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-WERKS sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-EBELN sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-EBELP sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-REF_DOC_NO sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-REF_DOC_ITEM sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-TAX_RATE sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-MATCHED_FLAG sy-vline 
WA_GTCN_TR_VENDOR_INV_STR-REMAINING_QTY sy-vline      INTO ld_text SEPARATED BY SPACE.

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