ABAP Select data from SAP table MMPUR_S_PR_ITM_CHANGE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MMPUR_S_PR_ITM_CHANGE 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_S_PR_ITM_CHANGE. 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_S_PR_ITM_CHANGE 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_S_PR_ITM_CHANGE TYPE STANDARD TABLE OF MMPUR_S_PR_ITM_CHANGE,
      WA_MMPUR_S_PR_ITM_CHANGE TYPE MMPUR_S_PR_ITM_CHANGE,
      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_S_PR_ITM_CHANGE> TYPE MMPUR_S_PR_ITM_CHANGE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPUR_S_PR_ITM_CHANGE
*  INTO TABLE @DATA(IT_MMPUR_S_PR_ITM_CHANGE2).
*--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_S_PR_ITM_CHANGE INDEX 1 INTO DATA(WA_MMPUR_S_PR_ITM_CHANGE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPUR_S_PR_ITM_CHANGE>-PURCHASEREQUISITION = 1.
<MMPUR_S_PR_ITM_CHANGE>-PURCHASEREQUISITIONITEM = 1.
<MMPUR_S_PR_ITM_CHANGE>-PURCHASINGGROUP = 1.
<MMPUR_S_PR_ITM_CHANGE>-PURCHASEREQUISITIONITEMTEXT = 1.
<MMPUR_S_PR_ITM_CHANGE>-STORAGELOCATION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPUR_S_PR_ITM_CHANGE-REQUIREMENTTRACK, sy-vline,
  WA_MMPUR_S_PR_ITM_CHANGE-MATERIALGROUP, sy-vline,
  WA_MMPUR_S_PR_ITM_CHANGE-DELIVERYDATE, sy-vline,
  WA_MMPUR_S_PR_ITM_CHANGE-PURCHASEREQUISITIONRELEASEDATE, sy-vline,
  WA_MMPUR_S_PR_ITM_CHANGE-PURCHASEREQUISITIONPRICE, sy-vline,
  WA_MMPUR_S_PR_ITM_CHANGE-PRICEUNIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMPUR_S_PR_ITM_CHANGE 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_S_PR_ITM_CHANGE 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_S_PR_ITM_CHANGE INTO WA_MMPUR_S_PR_ITM_CHANGE.


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

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

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

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

*Conversion exit ALPHA, internal->external for field PURCHASINGINFORECORD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_S_PR_ITM_CHANGE-PURCHASINGINFORECORD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_S_PR_ITM_CHANGE-PURCHASINGINFORECORD.
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_S_PR_ITM_CHANGE_STR, 
PURCHASEREQUISITION TYPE STRING,
PURCHASEREQUISITIONITEM TYPE STRING,
PURCHASINGGROUP TYPE STRING,
PURCHASEREQUISITIONITEMTEXT TYPE STRING,
STORAGELOCATION TYPE STRING,
REQUIREMENTTRACK TYPE STRING,
MATERIALGROUP TYPE STRING,
DELIVERYDATE TYPE STRING,
PURCHASEREQUISITIONRELEASEDATE TYPE STRING,
PURCHASEREQUISITIONPRICE TYPE STRING,
PRICEUNIT TYPE STRING,
SUPPLIER TYPE STRING,
FIXEDSUPPLIER TYPE STRING,
PURCHASINGORGANIZATION TYPE STRING,
PURCHASECONTRACT TYPE STRING,
PURCHASECONTRACTITEM TYPE STRING,
PURCHASINGINFORECORD TYPE STRING,
PURORDSUPPLIERMATERIALNUMBER TYPE STRING,
PURCHASEORDERPRICETYPE TYPE STRING,
GOODSRECEIPTISEXPECTED TYPE STRING,
GOODSRECEIPTISNONVALUATED TYPE STRING,
INVOICEISEXPECTED TYPE STRING,
TAXCODE TYPE STRING,
EXPECTEDOVERALLLIMITAMOUNT TYPE STRING,
OVERALLLIMITAMOUNT TYPE STRING,
DUMMY_EBAN_INCL_EEW_PS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMPUR_S_PR_ITM_CHANGE_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_S_PR_ITM_CHANGE_STR-PURCHASEREQUISITION sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURCHASEREQUISITIONITEM sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURCHASINGGROUP sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURCHASEREQUISITIONITEMTEXT sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-STORAGELOCATION sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-REQUIREMENTTRACK sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-MATERIALGROUP sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-DELIVERYDATE sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURCHASEREQUISITIONRELEASEDATE sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURCHASEREQUISITIONPRICE sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PRICEUNIT sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-SUPPLIER sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-FIXEDSUPPLIER sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURCHASINGORGANIZATION sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURCHASECONTRACT sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURCHASECONTRACTITEM sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURCHASINGINFORECORD sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURORDSUPPLIERMATERIALNUMBER sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-PURCHASEORDERPRICETYPE sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-GOODSRECEIPTISEXPECTED sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-GOODSRECEIPTISNONVALUATED sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-INVOICEISEXPECTED sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-TAXCODE sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-EXPECTEDOVERALLLIMITAMOUNT sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-OVERALLLIMITAMOUNT sy-vline 
WA_MMPUR_S_PR_ITM_CHANGE_STR-DUMMY_EBAN_INCL_EEW_PS sy-vline      INTO ld_text SEPARATED BY SPACE.

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