ABAP Select data from SAP table /SCWM/S_CHM_IDOC_LETRA_EXT 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_CHM_IDOC_LETRA_EXT 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_CHM_IDOC_LETRA_EXT. 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_CHM_IDOC_LETRA_EXT 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_CHM_IDOC_LETRA_EXT TYPE STANDARD TABLE OF /SCWM/S_CHM_IDOC_LETRA_EXT,
      WA_/SCWM/S_CHM_IDOC_LETRA_EXT TYPE /SCWM/S_CHM_IDOC_LETRA_EXT,
      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_CHM_IDOC_LETRA_EXT> TYPE /SCWM/S_CHM_IDOC_LETRA_EXT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/S_CHM_IDOC_LETRA_EXT
*  INTO TABLE @DATA(IT_/SCWM/S_CHM_IDOC_LETRA_EXT2).
*--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_CHM_IDOC_LETRA_EXT INDEX 1 INTO DATA(WA_/SCWM/S_CHM_IDOC_LETRA_EXT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/S_CHM_IDOC_LETRA_EXT>-DIRECT = 1.
</SCWM/S_CHM_IDOC_LETRA_EXT>-DOCNUM = 1.
</SCWM/S_CHM_IDOC_LETRA_EXT>-STATUS = 1.
</SCWM/S_CHM_IDOC_LETRA_EXT>-COUNTR = 1.
</SCWM/S_CHM_IDOC_LETRA_EXT>-STATXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/S_CHM_IDOC_LETRA_EXT-TKNUM, sy-vline,
  WA_/SCWM/S_CHM_IDOC_LETRA_EXT-CREDAT, sy-vline,
  WA_/SCWM/S_CHM_IDOC_LETRA_EXT-CRETIM, sy-vline,
  WA_/SCWM/S_CHM_IDOC_LETRA_EXT-UNAME, sy-vline,
  WA_/SCWM/S_CHM_IDOC_LETRA_EXT-STAPA1, sy-vline,
  WA_/SCWM/S_CHM_IDOC_LETRA_EXT-STAPA2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/S_CHM_IDOC_LETRA_EXT 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_CHM_IDOC_LETRA_EXT 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_CHM_IDOC_LETRA_EXT INTO WA_/SCWM/S_CHM_IDOC_LETRA_EXT.


*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 TKNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_CHM_IDOC_LETRA_EXT-TKNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_CHM_IDOC_LETRA_EXT-TKNUM.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field LOGSYS_ERP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/S_CHM_IDOC_LETRA_EXT-LOGSYS_ERP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/S_CHM_IDOC_LETRA_EXT-LOGSYS_ERP.
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_CHM_IDOC_LETRA_EXT_STR, 
DIRECT TYPE STRING,
DOCNUM TYPE STRING,
STATUS TYPE STRING,
COUNTR TYPE STRING,
STATXT TYPE STRING,
TKNUM TYPE STRING,
CREDAT TYPE STRING,
CRETIM TYPE STRING,
UNAME TYPE STRING,
STAPA1 TYPE STRING,
STAPA2 TYPE STRING,
STAPA3 TYPE STRING,
STAPA4 TYPE STRING,
TU_NUM TYPE STRING,
TU_NUM_EXT TYPE STRING,
LOGSYS_OWN TYPE STRING,
LOGSYS_ERP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/S_CHM_IDOC_LETRA_EXT_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_CHM_IDOC_LETRA_EXT_STR-DIRECT sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-DOCNUM sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-STATUS sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-COUNTR sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-STATXT sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-TKNUM sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-CREDAT sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-CRETIM sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-UNAME sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-STAPA1 sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-STAPA2 sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-STAPA3 sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-STAPA4 sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-TU_NUM sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-TU_NUM_EXT sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-LOGSYS_OWN sy-vline 
WA_/SCWM/S_CHM_IDOC_LETRA_EXT_STR-LOGSYS_ERP sy-vline      INTO ld_text SEPARATED BY SPACE.

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