ABAP Select data from SAP table MMPUR_PR_S_PO_ITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPUR_PR_S_PO_ITEM
*  INTO TABLE @DATA(IT_MMPUR_PR_S_PO_ITEM2).
*--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_MMPUR_PR_S_PO_ITEM INDEX 1 INTO DATA(WA_MMPUR_PR_S_PO_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPUR_PR_S_PO_ITEM>-KEY = 1.
<MMPUR_PR_S_PO_ITEM>-PARENT_KEY = 1.
<MMPUR_PR_S_PO_ITEM>-ROOT_KEY = 1.
<MMPUR_PR_S_PO_ITEM>-EBELP = 1.
<MMPUR_PR_S_PO_ITEM>-TXZ01 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPUR_PR_S_PO_ITEM-MATNR, sy-vline,
  WA_MMPUR_PR_S_PO_ITEM-MATERIAL_EXTERNAL, sy-vline,
  WA_MMPUR_PR_S_PO_ITEM-MATERIAL_GUID, sy-vline,
  WA_MMPUR_PR_S_PO_ITEM-MEINS, sy-vline,
  WA_MMPUR_PR_S_PO_ITEM-MENGE, sy-vline,
  WA_MMPUR_PR_S_PO_ITEM-IDNLF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMPUR_PR_S_PO_ITEM 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_MMPUR_PR_S_PO_ITEM 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_MMPUR_PR_S_PO_ITEM INTO WA_MMPUR_PR_S_PO_ITEM.


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

*Conversion exit MATNL, internal->external for field MATERIAL_EXTERNAL
CALL FUNCTION 'CONVERSION_EXIT_MATNL_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_PR_S_PO_ITEM-MATERIAL_EXTERNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_PR_S_PO_ITEM-MATERIAL_EXTERNAL.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit FMCIS, internal->external for field FIPOS
CALL FUNCTION 'CONVERSION_EXIT_FMCIS_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_PR_S_PO_ITEM-FIPOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_PR_S_PO_ITEM-FIPOS.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field BANFN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_PR_S_PO_ITEM-BANFN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_PR_S_PO_ITEM-BANFN.
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_MMPUR_PR_S_PO_ITEM_STR, 
KEY TYPE STRING,
PARENT_KEY TYPE STRING,
ROOT_KEY TYPE STRING,
EBELP TYPE STRING,
TXZ01 TYPE STRING,
MATNR TYPE STRING,
MATERIAL_EXTERNAL TYPE STRING,
MATERIAL_GUID TYPE STRING,
MEINS TYPE STRING,
MENGE TYPE STRING,
IDNLF TYPE STRING,
INFNR TYPE STRING,
MATKL TYPE STRING,
WERKS TYPE STRING,
PO_UNIT_ISO TYPE STRING,
NETPR TYPE STRING,
PEINH TYPE STRING,
PSTYP TYPE STRING,
KONNR TYPE STRING,
KTPNR TYPE STRING,
EKKOL TYPE STRING,
FIPOS TYPE STRING,
ANFNR TYPE STRING,
ANFPS TYPE STRING,
BANFN TYPE STRING,
BNFPO TYPE STRING,
WAERS TYPE STRING,
EINDT TYPE STRING,
DRAFT_ID TYPE STRING,
KNTTP TYPE STRING,
DUMMY_EKPO_INCL_EEW_PS TYPE STRING,
STARTDATE TYPE STRING,
ENDDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMPUR_PR_S_PO_ITEM_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_MMPUR_PR_S_PO_ITEM_STR-KEY sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-PARENT_KEY sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-ROOT_KEY sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-EBELP sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-TXZ01 sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-MATNR sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-MATERIAL_EXTERNAL sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-MATERIAL_GUID sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-MEINS sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-MENGE sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-IDNLF sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-INFNR sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-MATKL sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-WERKS sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-PO_UNIT_ISO sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-NETPR sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-PEINH sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-PSTYP sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-KONNR sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-KTPNR sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-EKKOL sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-FIPOS sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-ANFNR sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-ANFPS sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-BANFN sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-BNFPO sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-WAERS sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-EINDT sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-DRAFT_ID sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-KNTTP sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-DUMMY_EKPO_INCL_EEW_PS sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-STARTDATE sy-vline 
WA_MMPUR_PR_S_PO_ITEM_STR-ENDDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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