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

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/WAVEITM
*  INTO TABLE @DATA(IT_/SCWM/WAVEITM2).
*--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/WAVEITM INDEX 1 INTO DATA(WA_/SCWM/WAVEITM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/WAVEITM>-MANDT = 1.
</SCWM/WAVEITM>-LGNUM = 1.
</SCWM/WAVEITM>-WAVE = 1.
</SCWM/WAVEITM>-WAVE_ITM = 1.
</SCWM/WAVEITM>-RDOCID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/WAVEITM-RITMID, sy-vline,
  WA_/SCWM/WAVEITM-SPLIT_ID, sy-vline,
  WA_/SCWM/WAVEITM-DOCNO, sy-vline,
  WA_/SCWM/WAVEITM-ITEMNO, sy-vline,
  WA_/SCWM/WAVEITM-TYPE_2ST, sy-vline,
  WA_/SCWM/WAVEITM-STAT_CR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/WAVEITM 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/WAVEITM 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/WAVEITM INTO WA_/SCWM/WAVEITM.


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

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

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

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

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field TU_NUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/WAVEITM-TU_NUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/WAVEITM-TU_NUM.
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/WAVEITM_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
WAVE TYPE STRING,
WAVE_ITM TYPE STRING,
RDOCID TYPE STRING,
RITMID TYPE STRING,
SPLIT_ID TYPE STRING,
DOCNO TYPE STRING,
ITEMNO TYPE STRING,
TYPE_2ST TYPE STRING,
STAT_CR TYPE STRING,
WEIGHT TYPE STRING,
UNIT_W TYPE STRING,
VOLUM TYPE STRING,
UNIT_V TYPE STRING,
CAPA TYPE STRING,
WV_ERROR TYPE STRING,
SHIPTO TYPE STRING,
ROUTE_ID TYPE STRING,
REFDOCNO_SO TYPE STRING,
AAREA TYPE STRING,
MATNR TYPE STRING,
CHARG TYPE STRING,
OWNER TYPE STRING,
ENTITLED TYPE STRING,
QUAN TYPE STRING,
UNIT TYPE STRING,
TU_NUM TYPE STRING,
PROCTY TYPE STRING,
SIM_STATUS_ITM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/WAVEITM_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/WAVEITM_STR-MANDT sy-vline 
WA_/SCWM/WAVEITM_STR-LGNUM sy-vline 
WA_/SCWM/WAVEITM_STR-WAVE sy-vline 
WA_/SCWM/WAVEITM_STR-WAVE_ITM sy-vline 
WA_/SCWM/WAVEITM_STR-RDOCID sy-vline 
WA_/SCWM/WAVEITM_STR-RITMID sy-vline 
WA_/SCWM/WAVEITM_STR-SPLIT_ID sy-vline 
WA_/SCWM/WAVEITM_STR-DOCNO sy-vline 
WA_/SCWM/WAVEITM_STR-ITEMNO sy-vline 
WA_/SCWM/WAVEITM_STR-TYPE_2ST sy-vline 
WA_/SCWM/WAVEITM_STR-STAT_CR sy-vline 
WA_/SCWM/WAVEITM_STR-WEIGHT sy-vline 
WA_/SCWM/WAVEITM_STR-UNIT_W sy-vline 
WA_/SCWM/WAVEITM_STR-VOLUM sy-vline 
WA_/SCWM/WAVEITM_STR-UNIT_V sy-vline 
WA_/SCWM/WAVEITM_STR-CAPA sy-vline 
WA_/SCWM/WAVEITM_STR-WV_ERROR sy-vline 
WA_/SCWM/WAVEITM_STR-SHIPTO sy-vline 
WA_/SCWM/WAVEITM_STR-ROUTE_ID sy-vline 
WA_/SCWM/WAVEITM_STR-REFDOCNO_SO sy-vline 
WA_/SCWM/WAVEITM_STR-AAREA sy-vline 
WA_/SCWM/WAVEITM_STR-MATNR sy-vline 
WA_/SCWM/WAVEITM_STR-CHARG sy-vline 
WA_/SCWM/WAVEITM_STR-OWNER sy-vline 
WA_/SCWM/WAVEITM_STR-ENTITLED sy-vline 
WA_/SCWM/WAVEITM_STR-QUAN sy-vline 
WA_/SCWM/WAVEITM_STR-UNIT sy-vline 
WA_/SCWM/WAVEITM_STR-TU_NUM sy-vline 
WA_/SCWM/WAVEITM_STR-PROCTY sy-vline 
WA_/SCWM/WAVEITM_STR-SIM_STATUS_ITM sy-vline      INTO ld_text SEPARATED BY SPACE.

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