ABAP Select data from SAP table MMPUR_CTR_S_CREATE_ITEM_REFDOC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MMPUR_CTR_S_CREATE_ITEM_REFDOC 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_CTR_S_CREATE_ITEM_REFDOC. 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_CTR_S_CREATE_ITEM_REFDOC 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_CTR_S_CREATE_ITEM_REFDOC TYPE STANDARD TABLE OF MMPUR_CTR_S_CREATE_ITEM_REFDOC,
      WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC TYPE MMPUR_CTR_S_CREATE_ITEM_REFDOC,
      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_CTR_S_CREATE_ITEM_REFDOC> TYPE MMPUR_CTR_S_CREATE_ITEM_REFDOC.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPUR_CTR_S_CREATE_ITEM_REFDOC
*  INTO TABLE @DATA(IT_MMPUR_CTR_S_CREATE_ITEM_REFDOC2).
*--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_CTR_S_CREATE_ITEM_REFDOC INDEX 1 INTO DATA(WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPUR_CTR_S_CREATE_ITEM_REFDOC>-PURCHASECONTRACTITEM = 1.
<MMPUR_CTR_S_CREATE_ITEM_REFDOC>-PURCHASINGDOCUMENTITEMCATEGORY = 1.
<MMPUR_CTR_S_CREATE_ITEM_REFDOC>-MATERIAL = 1.
<MMPUR_CTR_S_CREATE_ITEM_REFDOC>-PURCHASECONTRACTITEMTEXT = 1.
<MMPUR_CTR_S_CREATE_ITEM_REFDOC>-MATERIALGROUP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC-PLANT, sy-vline,
  WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC-PRODUCTTYPE, sy-vline,
  WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC-PURCHASINGISITEMSET, sy-vline,
  WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC-PURCHASINGPARENTITEM, sy-vline,
  WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC-TARGETQUANTITY, sy-vline,
  WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC-ORDERQUANTITYUNIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC 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_CTR_S_CREATE_ITEM_REFDOC 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_CTR_S_CREATE_ITEM_REFDOC INTO WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC.


*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 MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC-MATERIAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ORDERQUANTITYUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC-ORDERQUANTITYUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC-ORDERQUANTITYUNIT.
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_CTR_S_CREATE_ITEM_REFDOC_STR, 
PURCHASECONTRACTITEM TYPE STRING,
PURCHASINGDOCUMENTITEMCATEGORY TYPE STRING,
MATERIAL TYPE STRING,
PURCHASECONTRACTITEMTEXT TYPE STRING,
MATERIALGROUP TYPE STRING,
PLANT TYPE STRING,
PRODUCTTYPE TYPE STRING,
PURCHASINGISITEMSET TYPE STRING,
PURCHASINGPARENTITEM TYPE STRING,
TARGETQUANTITY TYPE STRING,
ORDERQUANTITYUNIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_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_CTR_S_CREATE_ITEM_REFDOC_STR-PURCHASECONTRACTITEM sy-vline 
WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_STR-PURCHASINGDOCUMENTITEMCATEGORY sy-vline 
WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_STR-MATERIAL sy-vline 
WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_STR-PURCHASECONTRACTITEMTEXT sy-vline 
WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_STR-MATERIALGROUP sy-vline 
WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_STR-PLANT sy-vline 
WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_STR-PRODUCTTYPE sy-vline 
WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_STR-PURCHASINGISITEMSET sy-vline 
WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_STR-PURCHASINGPARENTITEM sy-vline 
WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_STR-TARGETQUANTITY sy-vline 
WA_MMPUR_CTR_S_CREATE_ITEM_REFDOC_STR-ORDERQUANTITYUNIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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