ABAP Select data from SAP table WOSI_POS_ERFA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WOSI_POS_ERFA
*  INTO TABLE @DATA(IT_WOSI_POS_ERFA2).
*--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_WOSI_POS_ERFA INDEX 1 INTO DATA(WA_WOSI_POS_ERFA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WOSI_POS_ERFA>-MATNR = 1.
<WOSI_POS_ERFA>-MAKTX = 1.
<WOSI_POS_ERFA>-ERFMG_CHAR = 1.
<WOSI_POS_ERFA>-ERFME = 1.
<WOSI_POS_ERFA>-EXVKW_CHAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WOSI_POS_ERFA-WAERS, sy-vline,
  WA_WOSI_POS_ERFA-DIFMG_ERFME, sy-vline,
  WA_WOSI_POS_ERFA-MEINS, sy-vline,
  WA_WOSI_POS_ERFA-DIFWT_POSWS, sy-vline,
  WA_WOSI_POS_ERFA-XZAEL, sy-vline,
  WA_WOSI_POS_ERFA-BSTAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WOSI_POS_ERFA 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_WOSI_POS_ERFA 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_WOSI_POS_ERFA INTO WA_WOSI_POS_ERFA.


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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field KDAUF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WOSI_POS_ERFA-KDAUF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WOSI_POS_ERFA-KDAUF.
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_WOSI_POS_ERFA_STR, 
MATNR TYPE STRING,
MAKTX TYPE STRING,
ERFMG_CHAR TYPE STRING,
ERFME TYPE STRING,
EXVKW_CHAR TYPE STRING,
WAERS TYPE STRING,
DIFMG_ERFME TYPE STRING,
MEINS TYPE STRING,
DIFWT_POSWS TYPE STRING,
XZAEL TYPE STRING,
BSTAR TYPE STRING,
CHARG TYPE STRING,
LIFNR TYPE STRING,
KUNNR TYPE STRING,
PS_PSP_PNR TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
ZEILI TYPE STRING,
MESSAGE TYPE STRING,
IAC_STAT TYPE STRING,
KWART TYPE STRING,
GRUND_CHAR TYPE STRING,
ITEM_ACTIV TYPE STRING,
PRUEFLOS_CHAR TYPE STRING,
QM_ACTIV TYPE STRING,
SOBKZ TYPE STRING,
BUCHM_ERFME TYPE STRING,
DMBTR_POSWS TYPE STRING,
POSWS TYPE STRING,
EXVKW_POSWS TYPE STRING,
BUCHW_POSWS TYPE STRING,
COUNT_TIME TYPE STRING,
COUNT_TIME_CHAR TYPE STRING,
WSTI_XCALC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WOSI_POS_ERFA_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_WOSI_POS_ERFA_STR-MATNR sy-vline 
WA_WOSI_POS_ERFA_STR-MAKTX sy-vline 
WA_WOSI_POS_ERFA_STR-ERFMG_CHAR sy-vline 
WA_WOSI_POS_ERFA_STR-ERFME sy-vline 
WA_WOSI_POS_ERFA_STR-EXVKW_CHAR sy-vline 
WA_WOSI_POS_ERFA_STR-WAERS sy-vline 
WA_WOSI_POS_ERFA_STR-DIFMG_ERFME sy-vline 
WA_WOSI_POS_ERFA_STR-MEINS sy-vline 
WA_WOSI_POS_ERFA_STR-DIFWT_POSWS sy-vline 
WA_WOSI_POS_ERFA_STR-XZAEL sy-vline 
WA_WOSI_POS_ERFA_STR-BSTAR sy-vline 
WA_WOSI_POS_ERFA_STR-CHARG sy-vline 
WA_WOSI_POS_ERFA_STR-LIFNR sy-vline 
WA_WOSI_POS_ERFA_STR-KUNNR sy-vline 
WA_WOSI_POS_ERFA_STR-PS_PSP_PNR sy-vline 
WA_WOSI_POS_ERFA_STR-KDAUF sy-vline 
WA_WOSI_POS_ERFA_STR-KDPOS sy-vline 
WA_WOSI_POS_ERFA_STR-ZEILI sy-vline 
WA_WOSI_POS_ERFA_STR-MESSAGE sy-vline 
WA_WOSI_POS_ERFA_STR-IAC_STAT sy-vline 
WA_WOSI_POS_ERFA_STR-KWART sy-vline 
WA_WOSI_POS_ERFA_STR-GRUND_CHAR sy-vline 
WA_WOSI_POS_ERFA_STR-ITEM_ACTIV sy-vline 
WA_WOSI_POS_ERFA_STR-PRUEFLOS_CHAR sy-vline 
WA_WOSI_POS_ERFA_STR-QM_ACTIV sy-vline 
WA_WOSI_POS_ERFA_STR-SOBKZ sy-vline 
WA_WOSI_POS_ERFA_STR-BUCHM_ERFME sy-vline 
WA_WOSI_POS_ERFA_STR-DMBTR_POSWS sy-vline 
WA_WOSI_POS_ERFA_STR-POSWS sy-vline 
WA_WOSI_POS_ERFA_STR-EXVKW_POSWS sy-vline 
WA_WOSI_POS_ERFA_STR-BUCHW_POSWS sy-vline 
WA_WOSI_POS_ERFA_STR-COUNT_TIME sy-vline 
WA_WOSI_POS_ERFA_STR-COUNT_TIME_CHAR sy-vline 
WA_WOSI_POS_ERFA_STR-WSTI_XCALC sy-vline      INTO ld_text SEPARATED BY SPACE.

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