ABAP Select data from SAP table BIW_NWA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BIW_NWA
*  INTO TABLE @DATA(IT_BIW_NWA2).
*--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_BIW_NWA INDEX 1 INTO DATA(WA_BIW_NWA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BIW_NWA>-MANDT = 1.
<BIW_NWA>-AUFNR = 1.
<BIW_NWA>-VORNR = 1.
<BIW_NWA>-APLZL = 1.
<BIW_NWA>-AUFPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BIW_NWA-PSPID_NP_I, sy-vline,
  WA_BIW_NWA-POSID_NP_I, sy-vline,
  WA_BIW_NWA-POSID_NV_I, sy-vline,
  WA_BIW_NWA-ERDAT, sy-vline,
  WA_BIW_NWA-AEDAT, sy-vline,
  WA_BIW_NWA-KOKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BIW_NWA 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_BIW_NWA 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_BIW_NWA INTO WA_BIW_NWA.


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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_BIW_NWA-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_NWA-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit KONPD, internal->external for field PSPID_NP_I
CALL FUNCTION 'CONVERSION_EXIT_KONPD_OUTPUT'
  EXPORTING
    input =                      WA_BIW_NWA-PSPID_NP_I
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_NWA-PSPID_NP_I.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field POSID_NP_I
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_BIW_NWA-POSID_NP_I
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_NWA-POSID_NP_I.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field POSID_NV_I
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_BIW_NWA-POSID_NV_I
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_NWA-POSID_NV_I.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field USE04
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_BIW_NWA-USE04
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_NWA-USE04.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field USE05
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_BIW_NWA-USE05
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_NWA-USE05.
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_BIW_NWA_STR, 
MANDT TYPE STRING,
AUFNR TYPE STRING,
VORNR TYPE STRING,
APLZL TYPE STRING,
AUFPL TYPE STRING,
PSPID_NP_I TYPE STRING,
POSID_NP_I TYPE STRING,
POSID_NV_I TYPE STRING,
ERDAT TYPE STRING,
AEDAT TYPE STRING,
KOKRS TYPE STRING,
AUTYP TYPE STRING,
DISPO TYPE STRING,
WERKS TYPE STRING,
ANFKO TYPE STRING,
GSBER TYPE STRING,
PRCTR TYPE STRING,
STEUS TYPE STRING,
LIFNR TYPE STRING,
SAKTO TYPE STRING,
WAERS TYPE STRING,
INFNR TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
MATKL TYPE STRING,
BUKRS TYPE STRING,
ANFKOKRS TYPE STRING,
LARNT TYPE STRING,
NPRIO TYPE STRING,
SCOPE TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
ARBID TYPE STRING,
SUMNR TYPE STRING,
TXTMD TYPE STRING,
OBJNR TYPE STRING,
USR00 TYPE STRING,
USR01 TYPE STRING,
USR02 TYPE STRING,
USR03 TYPE STRING,
USR04 TYPE STRING,
USE04 TYPE STRING,
USR05 TYPE STRING,
USE05 TYPE STRING,
USR06 TYPE STRING,
USE06 TYPE STRING,
USR07 TYPE STRING,
USE07 TYPE STRING,
USR08 TYPE STRING,
USR09 TYPE STRING,
USR10 TYPE STRING,
USR11 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BIW_NWA_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_BIW_NWA_STR-MANDT sy-vline 
WA_BIW_NWA_STR-AUFNR sy-vline 
WA_BIW_NWA_STR-VORNR sy-vline 
WA_BIW_NWA_STR-APLZL sy-vline 
WA_BIW_NWA_STR-AUFPL sy-vline 
WA_BIW_NWA_STR-PSPID_NP_I sy-vline 
WA_BIW_NWA_STR-POSID_NP_I sy-vline 
WA_BIW_NWA_STR-POSID_NV_I sy-vline 
WA_BIW_NWA_STR-ERDAT sy-vline 
WA_BIW_NWA_STR-AEDAT sy-vline 
WA_BIW_NWA_STR-KOKRS sy-vline 
WA_BIW_NWA_STR-AUTYP sy-vline 
WA_BIW_NWA_STR-DISPO sy-vline 
WA_BIW_NWA_STR-WERKS sy-vline 
WA_BIW_NWA_STR-ANFKO sy-vline 
WA_BIW_NWA_STR-GSBER sy-vline 
WA_BIW_NWA_STR-PRCTR sy-vline 
WA_BIW_NWA_STR-STEUS sy-vline 
WA_BIW_NWA_STR-LIFNR sy-vline 
WA_BIW_NWA_STR-SAKTO sy-vline 
WA_BIW_NWA_STR-WAERS sy-vline 
WA_BIW_NWA_STR-INFNR sy-vline 
WA_BIW_NWA_STR-EKORG sy-vline 
WA_BIW_NWA_STR-EKGRP sy-vline 
WA_BIW_NWA_STR-MATKL sy-vline 
WA_BIW_NWA_STR-BUKRS sy-vline 
WA_BIW_NWA_STR-ANFKOKRS sy-vline 
WA_BIW_NWA_STR-LARNT sy-vline 
WA_BIW_NWA_STR-NPRIO sy-vline 
WA_BIW_NWA_STR-SCOPE sy-vline 
WA_BIW_NWA_STR-EBELN sy-vline 
WA_BIW_NWA_STR-EBELP sy-vline 
WA_BIW_NWA_STR-ARBID sy-vline 
WA_BIW_NWA_STR-SUMNR sy-vline 
WA_BIW_NWA_STR-TXTMD sy-vline 
WA_BIW_NWA_STR-OBJNR sy-vline 
WA_BIW_NWA_STR-USR00 sy-vline 
WA_BIW_NWA_STR-USR01 sy-vline 
WA_BIW_NWA_STR-USR02 sy-vline 
WA_BIW_NWA_STR-USR03 sy-vline 
WA_BIW_NWA_STR-USR04 sy-vline 
WA_BIW_NWA_STR-USE04 sy-vline 
WA_BIW_NWA_STR-USR05 sy-vline 
WA_BIW_NWA_STR-USE05 sy-vline 
WA_BIW_NWA_STR-USR06 sy-vline 
WA_BIW_NWA_STR-USE06 sy-vline 
WA_BIW_NWA_STR-USR07 sy-vline 
WA_BIW_NWA_STR-USE07 sy-vline 
WA_BIW_NWA_STR-USR08 sy-vline 
WA_BIW_NWA_STR-USR09 sy-vline 
WA_BIW_NWA_STR-USR10 sy-vline 
WA_BIW_NWA_STR-USR11 sy-vline      INTO ld_text SEPARATED BY SPACE.

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