ABAP Select data from SAP table MRP_SOL_SUPPLY_DEMAND_ITEM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MRP_SOL_SUPPLY_DEMAND_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 MRP_SOL_SUPPLY_DEMAND_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 MRP_SOL_SUPPLY_DEMAND_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_MRP_SOL_SUPPLY_DEMAND_ITEM TYPE STANDARD TABLE OF MRP_SOL_SUPPLY_DEMAND_ITEM,
      WA_MRP_SOL_SUPPLY_DEMAND_ITEM TYPE MRP_SOL_SUPPLY_DEMAND_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: <MRP_SOL_SUPPLY_DEMAND_ITEM> TYPE MRP_SOL_SUPPLY_DEMAND_ITEM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRP_SOL_SUPPLY_DEMAND_ITEM
*  INTO TABLE @DATA(IT_MRP_SOL_SUPPLY_DEMAND_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_MRP_SOL_SUPPLY_DEMAND_ITEM INDEX 1 INTO DATA(WA_MRP_SOL_SUPPLY_DEMAND_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRP_SOL_SUPPLY_DEMAND_ITEM>-INDEX = 1.
<MRP_SOL_SUPPLY_DEMAND_ITEM>-MRPPLANT = 1.
<MRP_SOL_SUPPLY_DEMAND_ITEM>-MATERIALID = 1.
<MRP_SOL_SUPPLY_DEMAND_ITEM>-MATERIALEXTERNALID = 1.
<MRP_SOL_SUPPLY_DEMAND_ITEM>-MRPAREA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRP_SOL_SUPPLY_DEMAND_ITEM-MATERIALSHORTAGEDEFINITIONID, sy-vline,
  WA_MRP_SOL_SUPPLY_DEMAND_ITEM-MRPELEMENT, sy-vline,
  WA_MRP_SOL_SUPPLY_DEMAND_ITEM-MRPELEMENTAVAILYORRQMTDATE, sy-vline,
  WA_MRP_SOL_SUPPLY_DEMAND_ITEM-MRPELEMENTITEM, sy-vline,
  WA_MRP_SOL_SUPPLY_DEMAND_ITEM-MRPELEMENTCATEGORY, sy-vline,
  WA_MRP_SOL_SUPPLY_DEMAND_ITEM-MRPELEMENTCATEGORYSHORTNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRP_SOL_SUPPLY_DEMAND_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_MRP_SOL_SUPPLY_DEMAND_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_MRP_SOL_SUPPLY_DEMAND_ITEM INTO WA_MRP_SOL_SUPPLY_DEMAND_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 MATERIALID
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MRP_SOL_SUPPLY_DEMAND_ITEM-MATERIALID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRP_SOL_SUPPLY_DEMAND_ITEM-MATERIALID.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit MATN1, internal->external for field ASSEMBLY
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MRP_SOL_SUPPLY_DEMAND_ITEM-ASSEMBLY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRP_SOL_SUPPLY_DEMAND_ITEM-ASSEMBLY.
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_MRP_SOL_SUPPLY_DEMAND_ITEM_STR, 
INDEX TYPE STRING,
MRPPLANT TYPE STRING,
MATERIALID TYPE STRING,
MATERIALEXTERNALID TYPE STRING,
MRPAREA TYPE STRING,
MATERIALSHORTAGEDEFINITIONID TYPE STRING,
MRPELEMENT TYPE STRING,
MRPELEMENTAVAILYORRQMTDATE TYPE STRING,
MRPELEMENTITEM TYPE STRING,
MRPELEMENTCATEGORY TYPE STRING,
MRPELEMENTCATEGORYSHORTNAME TYPE STRING,
MRPELEMENTSCHEDULELINE TYPE STRING,
MRPAVAILABLEQUANTITY TYPE STRING,
MRPELEMENTOPENQUANTITY TYPE STRING,
MRPELEMENTDOCUMENTTYPE TYPE STRING,
MATERIALBASEUNIT TYPE STRING,
MATERIALBASEUNITSHORT TYPE STRING,
UNITOFMEASURECOMMERCIALNAME TYPE STRING,
VENDOR TYPE STRING,
VENDORNAME TYPE STRING,
VENDORPLANT TYPE STRING,
BP_TYPE TYPE STRING,
MRPELEMENTQUANTITYISFIRM TYPE STRING,
REQUIREMENTCOUNTER TYPE STRING,
QUANTITYPRECISION TYPE STRING,
RELEASED TYPE STRING,
PARTIALLYDELIVERED TYPE STRING,
REQUESTSTATUS TYPE STRING,
VENDORSTATUS TYPE STRING,
MRPAVAILABILITY TYPE STRING,
MATERIALSHORTAGECRITICALQTY TYPE STRING,
MATERIALSHORTAGETHRESHOLDQTY TYPE STRING,
SOURCEMRPELEMENT TYPE STRING,
SOURCEMRPELEMENTITEM TYPE STRING,
SOURCEMRPELEMENTSCHEDULELINE TYPE STRING,
SOURCEMRPELEMENTCATEGORY TYPE STRING,
ASSEMBLY TYPE STRING,
MRPELEMENT_INT TYPE STRING,
MRPELEMENTITEM_INT TYPE STRING,
MRPELEMENTSCHEDULELINE_INT TYPE STRING,
MATERIALSAFETYSTOCKQTY TYPE STRING,
MRPELEMENTDOCUMENTTYPENAME TYPE STRING,
SUPPLYINTHEPAST TYPE STRING,
TARGETQUANTITYUNITDISPLAYDCMLS TYPE STRING,
DUMMY_MRP_SOL_SUP_DEM_ITEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRP_SOL_SUPPLY_DEMAND_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_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-INDEX sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPPLANT sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MATERIALID sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MATERIALEXTERNALID sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPAREA sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MATERIALSHORTAGEDEFINITIONID sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENT sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTAVAILYORRQMTDATE sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTITEM sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTCATEGORY sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTCATEGORYSHORTNAME sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTSCHEDULELINE sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPAVAILABLEQUANTITY sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTOPENQUANTITY sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTDOCUMENTTYPE sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MATERIALBASEUNIT sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MATERIALBASEUNITSHORT sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-UNITOFMEASURECOMMERCIALNAME sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-VENDOR sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-VENDORNAME sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-VENDORPLANT sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-BP_TYPE sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTQUANTITYISFIRM sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-REQUIREMENTCOUNTER sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-QUANTITYPRECISION sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-RELEASED sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-PARTIALLYDELIVERED sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-REQUESTSTATUS sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-VENDORSTATUS sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPAVAILABILITY sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MATERIALSHORTAGECRITICALQTY sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MATERIALSHORTAGETHRESHOLDQTY sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-SOURCEMRPELEMENT sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-SOURCEMRPELEMENTITEM sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-SOURCEMRPELEMENTSCHEDULELINE sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-SOURCEMRPELEMENTCATEGORY sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-ASSEMBLY sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENT_INT sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTITEM_INT sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTSCHEDULELINE_INT sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MATERIALSAFETYSTOCKQTY sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-MRPELEMENTDOCUMENTTYPENAME sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-SUPPLYINTHEPAST sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-TARGETQUANTITYUNITDISPLAYDCMLS sy-vline 
WA_MRP_SOL_SUPPLY_DEMAND_ITEM_STR-DUMMY_MRP_SOL_SUP_DEM_ITEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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