ABAP Select data from SAP table MSG0 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MSG0 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 MSG0. 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 MSG0 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_MSG0 TYPE STANDARD TABLE OF MSG0,
      WA_MSG0 TYPE MSG0,
      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: <MSG0> TYPE MSG0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MSG0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MSG0
  INTO TABLE IT_MSG0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSG0
*  INTO TABLE @DATA(IT_MSG02).
*--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_MSG0 INDEX 1 INTO DATA(WA_MSG02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MSG0 ASSIGNING <MSG0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSG0>-MANDT = 1.
<MSG0>-KAPPL = 1.
<MSG0>-OBJKY = 1.
<MSG0>-KSCHL = 1.
<MSG0>-SPRAS = 1.

ENDLOOP.

LOOP AT IT_MSG0 INTO WA_MSG0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSG0-PARNR, sy-vline,
  WA_MSG0-PARVW, sy-vline,
  WA_MSG0-ERDAT, sy-vline,
  WA_MSG0-ERUHR, sy-vline,
  WA_MSG0-ADRNR, sy-vline,
  WA_MSG0-NACHA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSG0 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_MSG0 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_MSG0 INTO WA_MSG0.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MSG0-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG0-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PARNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MSG0-PARNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG0-PARNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MSG0-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG0-ADRNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SPDEV, internal->external for field LDEST
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_MSG0-LDEST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG0-LDEST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field TDSPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MSG0-TDSPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG0-TDSPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MSG0-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG0-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REFOB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MSG0-REFOB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG0-REFOB.
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_MSG0_STR, 
MANDT TYPE STRING,
KAPPL TYPE STRING,
OBJKY TYPE STRING,
KSCHL TYPE STRING,
SPRAS TYPE STRING,
PARNR TYPE STRING,
PARVW TYPE STRING,
ERDAT TYPE STRING,
ERUHR TYPE STRING,
ADRNR TYPE STRING,
NACHA TYPE STRING,
ANZAL TYPE STRING,
VSZTP TYPE STRING,
VSDAT TYPE STRING,
VSURA TYPE STRING,
VSURB TYPE STRING,
MANUE TYPE STRING,
DATVR TYPE STRING,
UHRVR TYPE STRING,
DATRE TYPE STRING,
USNAM TYPE STRING,
VSTAT TYPE STRING,
AKTIV TYPE STRING,
TCODE TYPE STRING,
LDEST TYPE STRING,
DSNAM TYPE STRING,
DSUF1 TYPE STRING,
DSUF2 TYPE STRING,
DIMME TYPE STRING,
DELET TYPE STRING,
TELFX TYPE STRING,
TELX1 TYPE STRING,
TELTX TYPE STRING,
AENDE TYPE STRING,
REPET TYPE STRING,
REPID TYPE STRING,
PFLD1 TYPE STRING,
PFLD2 TYPE STRING,
PFLD3 TYPE STRING,
PFLD4 TYPE STRING,
PFLD5 TYPE STRING,
PMID1 TYPE STRING,
PMID2 TYPE STRING,
PMID3 TYPE STRING,
PMID4 TYPE STRING,
PMID5 TYPE STRING,
TDNAME TYPE STRING,
TDID TYPE STRING,
TDSPRAS TYPE STRING,
EDIKEY TYPE STRING,
EDITRANS TYPE STRING,
SNDDR TYPE STRING,
SNDEX TYPE STRING,
SNDCP TYPE STRING,
SNDBC TYPE STRING,
FORFB TYPE STRING,
PRIFB TYPE STRING,
ACALL TYPE STRING,
OBJAC TYPE STRING,
OBJRR TYPE STRING,
OBJRN TYPE STRING,
OUTFL TYPE STRING,
OBJSNS TYPE STRING,
OBJPRI TYPE STRING,
OBJCP TYPE STRING,
NAUTO TYPE STRING,
TDRECEIVER TYPE STRING,
TDDIVISION TYPE STRING,
TDOCOVER TYPE STRING,
TDCOVTITLE TYPE STRING,
TDAUTORITY TYPE STRING,
TDARMOD TYPE STRING,
OPTARCNR TYPE STRING,
CMFPNR TYPE STRING,
USRNAM TYPE STRING,
EVENT TYPE STRING,
SORT1 TYPE STRING,
SORT2 TYPE STRING,
SORT3 TYPE STRING,
OBJTYPE TYPE STRING,
TDSCHEDULE TYPE STRING,
TLAND TYPE STRING,
_DATAAGING TYPE STRING,
SELFL TYPE STRING,
PCODE TYPE STRING,
TABIX TYPE STRING,
MSGNA TYPE STRING,
PARTX TYPE STRING,
PNAME TYPE STRING,
PCITY TYPE STRING,
PRILO TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
NBEAR TYPE STRING,
REFOB TYPE STRING,
DESCRP_NACHA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSG0_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_MSG0_STR-MANDT sy-vline 
WA_MSG0_STR-KAPPL sy-vline 
WA_MSG0_STR-OBJKY sy-vline 
WA_MSG0_STR-KSCHL sy-vline 
WA_MSG0_STR-SPRAS sy-vline 
WA_MSG0_STR-PARNR sy-vline 
WA_MSG0_STR-PARVW sy-vline 
WA_MSG0_STR-ERDAT sy-vline 
WA_MSG0_STR-ERUHR sy-vline 
WA_MSG0_STR-ADRNR sy-vline 
WA_MSG0_STR-NACHA sy-vline 
WA_MSG0_STR-ANZAL sy-vline 
WA_MSG0_STR-VSZTP sy-vline 
WA_MSG0_STR-VSDAT sy-vline 
WA_MSG0_STR-VSURA sy-vline 
WA_MSG0_STR-VSURB sy-vline 
WA_MSG0_STR-MANUE sy-vline 
WA_MSG0_STR-DATVR sy-vline 
WA_MSG0_STR-UHRVR sy-vline 
WA_MSG0_STR-DATRE sy-vline 
WA_MSG0_STR-USNAM sy-vline 
WA_MSG0_STR-VSTAT sy-vline 
WA_MSG0_STR-AKTIV sy-vline 
WA_MSG0_STR-TCODE sy-vline 
WA_MSG0_STR-LDEST sy-vline 
WA_MSG0_STR-DSNAM sy-vline 
WA_MSG0_STR-DSUF1 sy-vline 
WA_MSG0_STR-DSUF2 sy-vline 
WA_MSG0_STR-DIMME sy-vline 
WA_MSG0_STR-DELET sy-vline 
WA_MSG0_STR-TELFX sy-vline 
WA_MSG0_STR-TELX1 sy-vline 
WA_MSG0_STR-TELTX sy-vline 
WA_MSG0_STR-AENDE sy-vline 
WA_MSG0_STR-REPET sy-vline 
WA_MSG0_STR-REPID sy-vline 
WA_MSG0_STR-PFLD1 sy-vline 
WA_MSG0_STR-PFLD2 sy-vline 
WA_MSG0_STR-PFLD3 sy-vline 
WA_MSG0_STR-PFLD4 sy-vline 
WA_MSG0_STR-PFLD5 sy-vline 
WA_MSG0_STR-PMID1 sy-vline 
WA_MSG0_STR-PMID2 sy-vline 
WA_MSG0_STR-PMID3 sy-vline 
WA_MSG0_STR-PMID4 sy-vline 
WA_MSG0_STR-PMID5 sy-vline 
WA_MSG0_STR-TDNAME sy-vline 
WA_MSG0_STR-TDID sy-vline 
WA_MSG0_STR-TDSPRAS sy-vline 
WA_MSG0_STR-EDIKEY sy-vline 
WA_MSG0_STR-EDITRANS sy-vline 
WA_MSG0_STR-SNDDR sy-vline 
WA_MSG0_STR-SNDEX sy-vline 
WA_MSG0_STR-SNDCP sy-vline 
WA_MSG0_STR-SNDBC sy-vline 
WA_MSG0_STR-FORFB sy-vline 
WA_MSG0_STR-PRIFB sy-vline 
WA_MSG0_STR-ACALL sy-vline 
WA_MSG0_STR-OBJAC sy-vline 
WA_MSG0_STR-OBJRR sy-vline 
WA_MSG0_STR-OBJRN sy-vline 
WA_MSG0_STR-OUTFL sy-vline 
WA_MSG0_STR-OBJSNS sy-vline 
WA_MSG0_STR-OBJPRI sy-vline 
WA_MSG0_STR-OBJCP sy-vline 
WA_MSG0_STR-NAUTO sy-vline 
WA_MSG0_STR-TDRECEIVER sy-vline 
WA_MSG0_STR-TDDIVISION sy-vline 
WA_MSG0_STR-TDOCOVER sy-vline 
WA_MSG0_STR-TDCOVTITLE sy-vline 
WA_MSG0_STR-TDAUTORITY sy-vline 
WA_MSG0_STR-TDARMOD sy-vline 
WA_MSG0_STR-OPTARCNR sy-vline 
WA_MSG0_STR-CMFPNR sy-vline 
WA_MSG0_STR-USRNAM sy-vline 
WA_MSG0_STR-EVENT sy-vline 
WA_MSG0_STR-SORT1 sy-vline 
WA_MSG0_STR-SORT2 sy-vline 
WA_MSG0_STR-SORT3 sy-vline 
WA_MSG0_STR-OBJTYPE sy-vline 
WA_MSG0_STR-TDSCHEDULE sy-vline 
WA_MSG0_STR-TLAND sy-vline 
WA_MSG0_STR-_DATAAGING sy-vline 
WA_MSG0_STR-SELFL sy-vline 
WA_MSG0_STR-PCODE sy-vline 
WA_MSG0_STR-TABIX sy-vline 
WA_MSG0_STR-MSGNA sy-vline 
WA_MSG0_STR-PARTX sy-vline 
WA_MSG0_STR-PNAME sy-vline 
WA_MSG0_STR-PCITY sy-vline 
WA_MSG0_STR-PRILO sy-vline 
WA_MSG0_STR-MATNR sy-vline 
WA_MSG0_STR-MAKTX sy-vline 
WA_MSG0_STR-NBEAR sy-vline 
WA_MSG0_STR-REFOB sy-vline 
WA_MSG0_STR-DESCRP_NACHA sy-vline      INTO ld_text SEPARATED BY SPACE.

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