ABAP Select data from SAP table TWPIV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TWPIV
*  INTO TABLE @DATA(IT_TWPIV2).
*--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_TWPIV INDEX 1 INTO DATA(WA_TWPIV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TWPIV>-MANDT = 1.
<TWPIV>-INPRO = 1.
<TWPIV>-FINVM = 1.
<TWPIV>-FBILL = 1.
<TWPIV>-FREPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TWPIV-FSTAT, sy-vline,
  WA_TWPIV-ANDEB, sy-vline,
  WA_TWPIV-LGORT, sy-vline,
  WA_TWPIV-BWAVK, sy-vline,
  WA_TWPIV-BWART, sy-vline,
  WA_TWPIV-AUART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TWPIV 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_TWPIV 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_TWPIV INTO WA_TWPIV.


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

*Conversion exit AUART, internal->external for field AUART
CALL FUNCTION 'CONVERSION_EXIT_AUART_OUTPUT'
  EXPORTING
    input =                      WA_TWPIV-AUART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TWPIV-AUART.
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_TWPIV_STR, 
MANDT TYPE STRING,
INPRO TYPE STRING,
FINVM TYPE STRING,
FBILL TYPE STRING,
FREPL TYPE STRING,
FSTAT TYPE STRING,
ANDEB TYPE STRING,
LGORT TYPE STRING,
BWAVK TYPE STRING,
BWART TYPE STRING,
AUART TYPE STRING,
PSTYV TYPE STRING,
FKARA TYPE STRING,
KALSM TYPE STRING,
KSCHL TYPE STRING,
KKSCH TYPE STRING,
KPSTY TYPE STRING,
NUMLI TYPE STRING,
FXSTR TYPE STRING,
FSTATBW TYPE STRING,
FSTATRISBW TYPE STRING,
SRESP TYPE STRING,
SEND_PARTIAL_CONF TYPE STRING,
POS_WO_LISTING TYPE STRING,
CSGMT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TWPIV_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_TWPIV_STR-MANDT sy-vline 
WA_TWPIV_STR-INPRO sy-vline 
WA_TWPIV_STR-FINVM sy-vline 
WA_TWPIV_STR-FBILL sy-vline 
WA_TWPIV_STR-FREPL sy-vline 
WA_TWPIV_STR-FSTAT sy-vline 
WA_TWPIV_STR-ANDEB sy-vline 
WA_TWPIV_STR-LGORT sy-vline 
WA_TWPIV_STR-BWAVK sy-vline 
WA_TWPIV_STR-BWART sy-vline 
WA_TWPIV_STR-AUART sy-vline 
WA_TWPIV_STR-PSTYV sy-vline 
WA_TWPIV_STR-FKARA sy-vline 
WA_TWPIV_STR-KALSM sy-vline 
WA_TWPIV_STR-KSCHL sy-vline 
WA_TWPIV_STR-KKSCH sy-vline 
WA_TWPIV_STR-KPSTY sy-vline 
WA_TWPIV_STR-NUMLI sy-vline 
WA_TWPIV_STR-FXSTR sy-vline 
WA_TWPIV_STR-FSTATBW sy-vline 
WA_TWPIV_STR-FSTATRISBW sy-vline 
WA_TWPIV_STR-SRESP sy-vline 
WA_TWPIV_STR-SEND_PARTIAL_CONF sy-vline 
WA_TWPIV_STR-POS_WO_LISTING sy-vline 
WA_TWPIV_STR-CSGMT sy-vline      INTO ld_text SEPARATED BY SPACE.

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