ABAP Select data from SAP table MLSTI 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 MLSTI 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 MLSTI. 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 MLSTI 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_MLSTI TYPE STANDARD TABLE OF MLSTI,
      WA_MLSTI TYPE MLSTI,
      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: <MLSTI> TYPE MLSTI.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLSTI
*  INTO TABLE @DATA(IT_MLSTI2).
*--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_MLSTI INDEX 1 INTO DATA(WA_MLSTI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLSTI>-ARNUMMER = 1.
<MLSTI>-VSGRUPPE = 1.
<MLSTI>-VSNUMMER = 1.
<MLSTI>-PRCTR = 1.
<MLSTI>-PRNAM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLSTI-PRPOS, sy-vline,
  WA_MLSTI-PSPID, sy-vline,
  WA_MLSTI-POSID, sy-vline,
  WA_MLSTI-KDAUF, sy-vline,
  WA_MLSTI-KDPOS, sy-vline,
  WA_MLSTI-AUFNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLSTI 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_MLSTI 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_MLSTI INTO WA_MLSTI.


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

*Conversion exit POSID, internal->external for field PRPOS
CALL FUNCTION 'CONVERSION_EXIT_POSID_OUTPUT'
  EXPORTING
    input =                      WA_MLSTI-PRPOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLSTI-PRPOS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSN, internal->external for field PSPID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_MLSTI-PSPID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLSTI-PSPID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSN, internal->external for field POSID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_MLSTI-POSID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLSTI-POSID.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

*Conversion exit ABPSP, internal->external for field POSNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MLSTI-POSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLSTI-POSNR.
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_MLSTI_STR, 
ARNUMMER TYPE STRING,
VSGRUPPE TYPE STRING,
VSNUMMER TYPE STRING,
PRCTR TYPE STRING,
PRNAM TYPE STRING,
PRPOS TYPE STRING,
PSPID TYPE STRING,
POSID TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
AUFNR TYPE STRING,
VORNR TYPE STRING,
MLST_ZAEHL TYPE STRING,
AUARTTXT TYPE STRING,
AENNR TYPE STRING,
MLSTN TYPE STRING,
MLSTXT TYPE STRING,
TEDAT TYPE STRING,
TETIM TYPE STRING,
TPDAT TYPE STRING,
TPTIM TYPE STRING,
EDATU TYPE STRING,
EZEIT TYPE STRING,
PDATU TYPE STRING,
PZEIT TYPE STRING,
LATED TYPE STRING,
DLTAS TYPE STRING,
DELTA TYPE STRING,
DELTE TYPE STRING,
PRCNT TYPE STRING,
KZ_TREND TYPE STRING,
KZ_LSTWR TYPE STRING,
KZ_WFLOW TYPE STRING,
KZ_FAKTP TYPE STRING,
KZ_FRMST TYPE STRING,
LST_FERTG TYPE STRING,
LST_ACTDT TYPE STRING,
LST_ACTTM TYPE STRING,
TASK_ID TYPE STRING,
RELSU TYPE STRING,
RELMS TYPE STRING,
INCPN TYPE STRING,
INCNW TYPE STRING,
INCSN TYPE STRING,
WKFLW TYPE STRING,
RELSU_TSS TYPE STRING,
RELMS_TSS TYPE STRING,
INCNW_TSS TYPE STRING,
INCPN_TSS TYPE STRING,
INCSN_TSS TYPE STRING,
WKFLW_TSS TYPE STRING,
RELSU_TUS TYPE STRING,
RELMS_TUS TYPE STRING,
INCNW_TUS TYPE STRING,
INCPN_TUS TYPE STRING,
INCSN_TUS TYPE STRING,
WKFLW_TUS TYPE STRING,
RELSU_CH TYPE STRING,
RELMS_CH TYPE STRING,
INCPN_CH TYPE STRING,
INCNW_CH TYPE STRING,
INCSN_CH TYPE STRING,
WKFLW_CH TYPE STRING,
RELSU_SG TYPE STRING,
RELMS_SG TYPE STRING,
INCPN_SG TYPE STRING,
INCNW_SG TYPE STRING,
INCSN_SG TYPE STRING,
WKFLW_SG TYPE STRING,
RELSU_TR TYPE STRING,
RELMS_TR TYPE STRING,
INCPN_TR TYPE STRING,
INCNW_TR TYPE STRING,
INCSN_TR TYPE STRING,
WKFLW_TR TYPE STRING,
KTEXT TYPE STRING,
LTXSP TYPE STRING,
FRUEHER TYPE STRING,
SPAETER TYPE STRING,
VERZUG TYPE STRING,
VORBEI TYPE STRING,
VEINH TYPE STRING,
WBSPOST1 TYPE STRING,
PROJPOST1 TYPE STRING,
NETPOST1 TYPE STRING,
EEW_MLST_PS_DUMMY TYPE STRING,
AUTYP TYPE STRING,
ZAEHL TYPE STRING,
VGTYP TYPE STRING,
POSNR TYPE STRING,
INT_ID TYPE STRING,
LOEKZ TYPE STRING,
LIGHT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLSTI_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_MLSTI_STR-ARNUMMER sy-vline 
WA_MLSTI_STR-VSGRUPPE sy-vline 
WA_MLSTI_STR-VSNUMMER sy-vline 
WA_MLSTI_STR-PRCTR sy-vline 
WA_MLSTI_STR-PRNAM sy-vline 
WA_MLSTI_STR-PRPOS sy-vline 
WA_MLSTI_STR-PSPID sy-vline 
WA_MLSTI_STR-POSID sy-vline 
WA_MLSTI_STR-KDAUF sy-vline 
WA_MLSTI_STR-KDPOS sy-vline 
WA_MLSTI_STR-AUFNR sy-vline 
WA_MLSTI_STR-VORNR sy-vline 
WA_MLSTI_STR-MLST_ZAEHL sy-vline 
WA_MLSTI_STR-AUARTTXT sy-vline 
WA_MLSTI_STR-AENNR sy-vline 
WA_MLSTI_STR-MLSTN sy-vline 
WA_MLSTI_STR-MLSTXT sy-vline 
WA_MLSTI_STR-TEDAT sy-vline 
WA_MLSTI_STR-TETIM sy-vline 
WA_MLSTI_STR-TPDAT sy-vline 
WA_MLSTI_STR-TPTIM sy-vline 
WA_MLSTI_STR-EDATU sy-vline 
WA_MLSTI_STR-EZEIT sy-vline 
WA_MLSTI_STR-PDATU sy-vline 
WA_MLSTI_STR-PZEIT sy-vline 
WA_MLSTI_STR-LATED sy-vline 
WA_MLSTI_STR-DLTAS sy-vline 
WA_MLSTI_STR-DELTA sy-vline 
WA_MLSTI_STR-DELTE sy-vline 
WA_MLSTI_STR-PRCNT sy-vline 
WA_MLSTI_STR-KZ_TREND sy-vline 
WA_MLSTI_STR-KZ_LSTWR sy-vline 
WA_MLSTI_STR-KZ_WFLOW sy-vline 
WA_MLSTI_STR-KZ_FAKTP sy-vline 
WA_MLSTI_STR-KZ_FRMST sy-vline 
WA_MLSTI_STR-LST_FERTG sy-vline 
WA_MLSTI_STR-LST_ACTDT sy-vline 
WA_MLSTI_STR-LST_ACTTM sy-vline 
WA_MLSTI_STR-TASK_ID sy-vline 
WA_MLSTI_STR-RELSU sy-vline 
WA_MLSTI_STR-RELMS sy-vline 
WA_MLSTI_STR-INCPN sy-vline 
WA_MLSTI_STR-INCNW sy-vline 
WA_MLSTI_STR-INCSN sy-vline 
WA_MLSTI_STR-WKFLW sy-vline 
WA_MLSTI_STR-RELSU_TSS sy-vline 
WA_MLSTI_STR-RELMS_TSS sy-vline 
WA_MLSTI_STR-INCNW_TSS sy-vline 
WA_MLSTI_STR-INCPN_TSS sy-vline 
WA_MLSTI_STR-INCSN_TSS sy-vline 
WA_MLSTI_STR-WKFLW_TSS sy-vline 
WA_MLSTI_STR-RELSU_TUS sy-vline 
WA_MLSTI_STR-RELMS_TUS sy-vline 
WA_MLSTI_STR-INCNW_TUS sy-vline 
WA_MLSTI_STR-INCPN_TUS sy-vline 
WA_MLSTI_STR-INCSN_TUS sy-vline 
WA_MLSTI_STR-WKFLW_TUS sy-vline 
WA_MLSTI_STR-RELSU_CH sy-vline 
WA_MLSTI_STR-RELMS_CH sy-vline 
WA_MLSTI_STR-INCPN_CH sy-vline 
WA_MLSTI_STR-INCNW_CH sy-vline 
WA_MLSTI_STR-INCSN_CH sy-vline 
WA_MLSTI_STR-WKFLW_CH sy-vline 
WA_MLSTI_STR-RELSU_SG sy-vline 
WA_MLSTI_STR-RELMS_SG sy-vline 
WA_MLSTI_STR-INCPN_SG sy-vline 
WA_MLSTI_STR-INCNW_SG sy-vline 
WA_MLSTI_STR-INCSN_SG sy-vline 
WA_MLSTI_STR-WKFLW_SG sy-vline 
WA_MLSTI_STR-RELSU_TR sy-vline 
WA_MLSTI_STR-RELMS_TR sy-vline 
WA_MLSTI_STR-INCPN_TR sy-vline 
WA_MLSTI_STR-INCNW_TR sy-vline 
WA_MLSTI_STR-INCSN_TR sy-vline 
WA_MLSTI_STR-WKFLW_TR sy-vline 
WA_MLSTI_STR-KTEXT sy-vline 
WA_MLSTI_STR-LTXSP sy-vline 
WA_MLSTI_STR-FRUEHER sy-vline 
WA_MLSTI_STR-SPAETER sy-vline 
WA_MLSTI_STR-VERZUG sy-vline 
WA_MLSTI_STR-VORBEI sy-vline 
WA_MLSTI_STR-VEINH sy-vline 
WA_MLSTI_STR-WBSPOST1 sy-vline 
WA_MLSTI_STR-PROJPOST1 sy-vline 
WA_MLSTI_STR-NETPOST1 sy-vline 
WA_MLSTI_STR-EEW_MLST_PS_DUMMY sy-vline 
WA_MLSTI_STR-AUTYP sy-vline 
WA_MLSTI_STR-ZAEHL sy-vline 
WA_MLSTI_STR-VGTYP sy-vline 
WA_MLSTI_STR-POSNR sy-vline 
WA_MLSTI_STR-INT_ID sy-vline 
WA_MLSTI_STR-LOEKZ sy-vline 
WA_MLSTI_STR-LIGHT sy-vline      INTO ld_text SEPARATED BY SPACE.

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