ABAP Select data from SAP table /SCWM/S_PRE_ALLOCATED into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SCWM/S_PRE_ALLOCATED 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 /SCWM/S_PRE_ALLOCATED. 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 /SCWM/S_PRE_ALLOCATED 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_/SCWM/S_PRE_ALLOCATED TYPE STANDARD TABLE OF /SCWM/S_PRE_ALLOCATED,
      WA_/SCWM/S_PRE_ALLOCATED TYPE /SCWM/S_PRE_ALLOCATED,
      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: </SCWM/S_PRE_ALLOCATED> TYPE /SCWM/S_PRE_ALLOCATED.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SCWM/S_PRE_ALLOCATED
  INTO TABLE IT_/SCWM/S_PRE_ALLOCATED.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/S_PRE_ALLOCATED
*  INTO TABLE @DATA(IT_/SCWM/S_PRE_ALLOCATED2).
*--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_/SCWM/S_PRE_ALLOCATED INDEX 1 INTO DATA(WA_/SCWM/S_PRE_ALLOCATED2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SCWM/S_PRE_ALLOCATED ASSIGNING </SCWM/S_PRE_ALLOCATED>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/S_PRE_ALLOCATED>-MANDT = 1.
</SCWM/S_PRE_ALLOCATED>-LGNUM = 1.
</SCWM/S_PRE_ALLOCATED>-MATID = 1.
</SCWM/S_PRE_ALLOCATED>-GUID_PAS = 1.
</SCWM/S_PRE_ALLOCATED>-STOCK_TYPE = 1.

ENDLOOP.

LOOP AT IT_/SCWM/S_PRE_ALLOCATED INTO WA_/SCWM/S_PRE_ALLOCATED.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/S_PRE_ALLOCATED-CHARG, sy-vline,
  WA_/SCWM/S_PRE_ALLOCATED-BATCHID, sy-vline,
  WA_/SCWM/S_PRE_ALLOCATED-LGPLA, sy-vline,
  WA_/SCWM/S_PRE_ALLOCATED-STOCK_USAGE, sy-vline,
  WA_/SCWM/S_PRE_ALLOCATED-OWNER, sy-vline,
  WA_/SCWM/S_PRE_ALLOCATED-OWNER_ROLE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/S_PRE_ALLOCATED 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_/SCWM/S_PRE_ALLOCATED 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_/SCWM/S_PRE_ALLOCATED INTO WA_/SCWM/S_PRE_ALLOCATED.


*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 MDLPD, internal->external for field MATID
CALL FUNCTION 'CONVERSION_EXIT_MDLPD_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_PRE_ALLOCATED-MATID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_PRE_ALLOCATED-MATID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit BPMAP, internal->external for field OWNER
CALL FUNCTION 'CONVERSION_EXIT_BPMAP_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_PRE_ALLOCATED-OWNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_PRE_ALLOCATED-OWNER.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit TSTWH, internal->external for field CREATED_AT
CALL FUNCTION 'CONVERSION_EXIT_TSTWH_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_PRE_ALLOCATED-CREATED_AT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_PRE_ALLOCATED-CREATED_AT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTWH, internal->external for field CHANGED_AT
CALL FUNCTION 'CONVERSION_EXIT_TSTWH_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_PRE_ALLOCATED-CHANGED_AT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_PRE_ALLOCATED-CHANGED_AT.
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_/SCWM/S_PRE_ALLOCATED_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
MATID TYPE STRING,
GUID_PAS TYPE STRING,
STOCK_TYPE TYPE STRING,
CHARG TYPE STRING,
BATCHID TYPE STRING,
LGPLA TYPE STRING,
STOCK_USAGE TYPE STRING,
OWNER TYPE STRING,
OWNER_ROLE TYPE STRING,
ENTITLED TYPE STRING,
ENTITLED_ROLE TYPE STRING,
STOCK_DOCCAT TYPE STRING,
STOCK_DOCNO TYPE STRING,
STOCK_ITMNO TYPE STRING,
REF_DOCCAT TYPE STRING,
REF_DOCNO TYPE STRING,
REF_ITMNO TYPE STRING,
MEINS TYPE STRING,
ALTME TYPE STRING,
QUAN_REQ TYPE STRING,
QUAN_PRO TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_AT TYPE STRING,
CHANGED_BY TYPE STRING,
CHANGED_AT TYPE STRING,
TPAS_EEW_DUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/S_PRE_ALLOCATED_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_/SCWM/S_PRE_ALLOCATED_STR-MANDT sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-LGNUM sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-MATID sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-GUID_PAS sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-STOCK_TYPE sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-CHARG sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-BATCHID sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-LGPLA sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-STOCK_USAGE sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-OWNER sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-OWNER_ROLE sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-ENTITLED sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-ENTITLED_ROLE sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-STOCK_DOCCAT sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-STOCK_DOCNO sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-STOCK_ITMNO sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-REF_DOCCAT sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-REF_DOCNO sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-REF_ITMNO sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-MEINS sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-ALTME sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-QUAN_REQ sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-QUAN_PRO sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-CREATED_BY sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-CREATED_AT sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-CHANGED_BY sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-CHANGED_AT sy-vline 
WA_/SCWM/S_PRE_ALLOCATED_STR-TPAS_EEW_DUMMY sy-vline      INTO ld_text SEPARATED BY SPACE.

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