ABAP Select data from SAP table VLCACTDATA_MM_HEAD_S into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VLCACTDATA_MM_HEAD_S
*  INTO TABLE @DATA(IT_VLCACTDATA_MM_HEAD_S2).
*--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_VLCACTDATA_MM_HEAD_S INDEX 1 INTO DATA(WA_VLCACTDATA_MM_HEAD_S2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VLCACTDATA_MM_HEAD_S>-EKORG = 1.
<VLCACTDATA_MM_HEAD_S>-EKGRP = 1.
<VLCACTDATA_MM_HEAD_S>-MATNR = 1.
<VLCACTDATA_MM_HEAD_S>-NUMOFVEHI = 1.
<VLCACTDATA_MM_HEAD_S>-UNIT_OF_MEASURE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VLCACTDATA_MM_HEAD_S-BSTYP, sy-vline,
  WA_VLCACTDATA_MM_HEAD_S-BSART, sy-vline,
  WA_VLCACTDATA_MM_HEAD_S-LIFNR, sy-vline,
  WA_VLCACTDATA_MM_HEAD_S-REWORKER, sy-vline,
  WA_VLCACTDATA_MM_HEAD_S-PSTYP, sy-vline,
  WA_VLCACTDATA_MM_HEAD_S-EBELN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VLCACTDATA_MM_HEAD_S 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_VLCACTDATA_MM_HEAD_S 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_VLCACTDATA_MM_HEAD_S INTO WA_VLCACTDATA_MM_HEAD_S.


*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_VLCACTDATA_MM_HEAD_S-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VLCACTDATA_MM_HEAD_S-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VLCACTDATA_MM_HEAD_S-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VLCACTDATA_MM_HEAD_S-BELNR.
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_VLCACTDATA_MM_HEAD_S_STR, 
EKORG TYPE STRING,
EKGRP TYPE STRING,
MATNR TYPE STRING,
NUMOFVEHI TYPE STRING,
UNIT_OF_MEASURE TYPE STRING,
BSTYP TYPE STRING,
BSART TYPE STRING,
LIFNR TYPE STRING,
REWORKER TYPE STRING,
PSTYP TYPE STRING,
EBELN TYPE STRING,
NETPR TYPE STRING,
EINDT TYPE STRING,
LPEIN TYPE STRING,
DOC_DATE TYPE STRING,
PSTNG_DATE TYPE STRING,
CURRENCY TYPE STRING,
GROSS_AMOUNT TYPE STRING,
PMNTTRMS TYPE STRING,
TAX_CODE TYPE STRING,
TAX_AMOUNT TYPE STRING,
KALSM TYPE STRING,
REF_DOC_NO TYPE STRING,
INVOICEDOCNUMBER TYPE STRING,
FISCALYEAR TYPE STRING,
REVREASON TYPE STRING,
REV_INVDOCNO TYPE STRING,
REV_FISCYEAR TYPE STRING,
ADDR_HANDLE_CPD TYPE STRING,
KTOKK TYPE STRING,
BELNR TYPE STRING,
BUDAT_RV TYPE STRING,
BKTXT_RV TYPE STRING,
XBLNR_RV TYPE STRING,
VPRSV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VLCACTDATA_MM_HEAD_S_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_VLCACTDATA_MM_HEAD_S_STR-EKORG sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-EKGRP sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-MATNR sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-NUMOFVEHI sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-UNIT_OF_MEASURE sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-BSTYP sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-BSART sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-LIFNR sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-REWORKER sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-PSTYP sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-EBELN sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-NETPR sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-EINDT sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-LPEIN sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-DOC_DATE sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-PSTNG_DATE sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-CURRENCY sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-GROSS_AMOUNT sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-PMNTTRMS sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-TAX_CODE sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-TAX_AMOUNT sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-KALSM sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-REF_DOC_NO sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-INVOICEDOCNUMBER sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-FISCALYEAR sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-REVREASON sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-REV_INVDOCNO sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-REV_FISCYEAR sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-ADDR_HANDLE_CPD sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-KTOKK sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-BELNR sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-BUDAT_RV sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-BKTXT_RV sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-XBLNR_RV sy-vline 
WA_VLCACTDATA_MM_HEAD_S_STR-VPRSV sy-vline      INTO ld_text SEPARATED BY SPACE.

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