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

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/POHUHDRTW
*  INTO TABLE @DATA(IT_/SCWM/POHUHDRTW2).
*--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/POHUHDRTW INDEX 1 INTO DATA(WA_/SCWM/POHUHDRTW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/POHUHDRTW>-MANDT = 1.
</SCWM/POHUHDRTW>-GUID_HU = 1.
</SCWM/POHUHDRTW>-ORIGINAL_DOCCAT = 1.
</SCWM/POHUHDRTW>-ORIGINAL_DOCID = 1.
</SCWM/POHUHDRTW>-ORIGINAL_ITMID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/POHUHDRTW-TWHUTYPE, sy-vline,
  WA_/SCWM/POHUHDRTW-TU_NUM_TW, sy-vline,
  WA_/SCWM/POHUHDRTW-TU_SR_ACT_NUM_TW, sy-vline,
  WA_/SCWM/POHUHDRTW-FRD_NUM, sy-vline,
  WA_/SCWM/POHUHDRTW-FRD_ITEM, sy-vline,
  WA_/SCWM/POHUHDRTW-FRD_ITEM_CAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/POHUHDRTW 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/POHUHDRTW 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/POHUHDRTW INTO WA_/SCWM/POHUHDRTW.


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

*Conversion exit ALPH0, internal->external for field TU_SR_ACT_NUM_TW
CALL FUNCTION 'CONVERSION_EXIT_ALPH0_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/POHUHDRTW-TU_SR_ACT_NUM_TW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/POHUHDRTW-TU_SR_ACT_NUM_TW.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit ALPH0, internal->external for field VEH_SR_ACT_NUM_TW
CALL FUNCTION 'CONVERSION_EXIT_ALPH0_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/POHUHDRTW-VEH_SR_ACT_NUM_TW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/POHUHDRTW-VEH_SR_ACT_NUM_TW.
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/POHUHDRTW_STR, 
MANDT TYPE STRING,
GUID_HU TYPE STRING,
ORIGINAL_DOCCAT TYPE STRING,
ORIGINAL_DOCID TYPE STRING,
ORIGINAL_ITMID TYPE STRING,
TWHUTYPE TYPE STRING,
TU_NUM_TW TYPE STRING,
TU_SR_ACT_NUM_TW TYPE STRING,
FRD_NUM TYPE STRING,
FRD_ITEM TYPE STRING,
FRD_ITEM_CAT TYPE STRING,
STOP_ID_FO TYPE STRING,
TRANSPL_LOGSYS TYPE STRING,
MTR TYPE STRING,
VEH_NUM_TW TYPE STRING,
VEH_SR_ACT_NUM_TW TYPE STRING,
ACS_TARGET TYPE STRING,
DEP_COUNTRY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/POHUHDRTW_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/POHUHDRTW_STR-MANDT sy-vline 
WA_/SCWM/POHUHDRTW_STR-GUID_HU sy-vline 
WA_/SCWM/POHUHDRTW_STR-ORIGINAL_DOCCAT sy-vline 
WA_/SCWM/POHUHDRTW_STR-ORIGINAL_DOCID sy-vline 
WA_/SCWM/POHUHDRTW_STR-ORIGINAL_ITMID sy-vline 
WA_/SCWM/POHUHDRTW_STR-TWHUTYPE sy-vline 
WA_/SCWM/POHUHDRTW_STR-TU_NUM_TW sy-vline 
WA_/SCWM/POHUHDRTW_STR-TU_SR_ACT_NUM_TW sy-vline 
WA_/SCWM/POHUHDRTW_STR-FRD_NUM sy-vline 
WA_/SCWM/POHUHDRTW_STR-FRD_ITEM sy-vline 
WA_/SCWM/POHUHDRTW_STR-FRD_ITEM_CAT sy-vline 
WA_/SCWM/POHUHDRTW_STR-STOP_ID_FO sy-vline 
WA_/SCWM/POHUHDRTW_STR-TRANSPL_LOGSYS sy-vline 
WA_/SCWM/POHUHDRTW_STR-MTR sy-vline 
WA_/SCWM/POHUHDRTW_STR-VEH_NUM_TW sy-vline 
WA_/SCWM/POHUHDRTW_STR-VEH_SR_ACT_NUM_TW sy-vline 
WA_/SCWM/POHUHDRTW_STR-ACS_TARGET sy-vline 
WA_/SCWM/POHUHDRTW_STR-DEP_COUNTRY sy-vline      INTO ld_text SEPARATED BY SPACE.

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