ABAP Select data from SAP table WSTI_INV_DOC_HEAD_SC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WSTI_INV_DOC_HEAD_SC 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 WSTI_INV_DOC_HEAD_SC. 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 WSTI_INV_DOC_HEAD_SC 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_WSTI_INV_DOC_HEAD_SC TYPE STANDARD TABLE OF WSTI_INV_DOC_HEAD_SC,
      WA_WSTI_INV_DOC_HEAD_SC TYPE WSTI_INV_DOC_HEAD_SC,
      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: <WSTI_INV_DOC_HEAD_SC> TYPE WSTI_INV_DOC_HEAD_SC.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSTI_INV_DOC_HEAD_SC
*  INTO TABLE @DATA(IT_WSTI_INV_DOC_HEAD_SC2).
*--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_WSTI_INV_DOC_HEAD_SC INDEX 1 INTO DATA(WA_WSTI_INV_DOC_HEAD_SC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSTI_INV_DOC_HEAD_SC>-WAERS = 1.
<WSTI_INV_DOC_HEAD_SC>-ABWEI = 1.
<WSTI_INV_DOC_HEAD_SC>-SWERT = 1.
<WSTI_INV_DOC_HEAD_SC>-MI04_ALLOWED = 1.
<WSTI_INV_DOC_HEAD_SC>-MI05_ALLOWED = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSTI_INV_DOC_HEAD_SC-MI07_ALLOWED, sy-vline,
  WA_WSTI_INV_DOC_HEAD_SC-ZLDAT_IN, sy-vline,
  WA_WSTI_INV_DOC_HEAD_SC-BUDAT_IN, sy-vline,
  WA_WSTI_INV_DOC_HEAD_SC-ABWEI_CHAR, sy-vline,
  WA_WSTI_INV_DOC_HEAD_SC-SWERT_CHAR, sy-vline,
  WA_WSTI_INV_DOC_HEAD_SC-ZLDAT_IN_CHAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSTI_INV_DOC_HEAD_SC 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_WSTI_INV_DOC_HEAD_SC 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_WSTI_INV_DOC_HEAD_SC INTO WA_WSTI_INV_DOC_HEAD_SC.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_WSTI_INV_DOC_HEAD_SC_STR, 
WAERS TYPE STRING,
ABWEI TYPE STRING,
SWERT TYPE STRING,
MI04_ALLOWED TYPE STRING,
MI05_ALLOWED TYPE STRING,
MI07_ALLOWED TYPE STRING,
ZLDAT_IN TYPE STRING,
BUDAT_IN TYPE STRING,
ABWEI_CHAR TYPE STRING,
SWERT_CHAR TYPE STRING,
ZLDAT_IN_CHAR TYPE STRING,
BUDAT_IN_CHAR TYPE STRING,
SOTXT TYPE STRING,
MI07_USER_ALLOWED TYPE STRING,
LGOBE TYPE STRING,
NAME1 TYPE STRING,
WGBEZ TYPE STRING,
COUNT_TIME TYPE STRING,
COUNT_TIME_CHAR TYPE STRING,
COUNT_TIME_STAT TYPE STRING,
MANDT TYPE STRING,
IBLNR TYPE STRING,
GJAHR TYPE STRING,
VGART TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
SOBKZ TYPE STRING,
BLDAT TYPE STRING,
GIDAT TYPE STRING,
ZLDAT TYPE STRING,
BUDAT TYPE STRING,
MONAT TYPE STRING,
USNAM TYPE STRING,
SPERR TYPE STRING,
ZSTAT TYPE STRING,
DSTAT TYPE STRING,
XBLNI TYPE STRING,
LSTAT TYPE STRING,
XBUFI TYPE STRING,
KEORD TYPE STRING,
ORDNG TYPE STRING,
INVNU TYPE STRING,
IBLTXT TYPE STRING,
WSTI_BSTAT TYPE STRING,
LGPBE TYPE STRING,
ITEMS_W_DIFF TYPE STRING,
PDC_STATUS TYPE STRING,
PDC_STATUS_TOOLTIP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSTI_INV_DOC_HEAD_SC_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_WSTI_INV_DOC_HEAD_SC_STR-WAERS sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-ABWEI sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-SWERT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-MI04_ALLOWED sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-MI05_ALLOWED sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-MI07_ALLOWED sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-ZLDAT_IN sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-BUDAT_IN sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-ABWEI_CHAR sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-SWERT_CHAR sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-ZLDAT_IN_CHAR sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-BUDAT_IN_CHAR sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-SOTXT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-MI07_USER_ALLOWED sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-LGOBE sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-NAME1 sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-WGBEZ sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-COUNT_TIME sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-COUNT_TIME_CHAR sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-COUNT_TIME_STAT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-MANDT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-IBLNR sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-GJAHR sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-VGART sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-WERKS sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-LGORT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-SOBKZ sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-BLDAT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-GIDAT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-ZLDAT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-BUDAT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-MONAT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-USNAM sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-SPERR sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-ZSTAT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-DSTAT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-XBLNI sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-LSTAT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-XBUFI sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-KEORD sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-ORDNG sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-INVNU sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-IBLTXT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-WSTI_BSTAT sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-LGPBE sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-ITEMS_W_DIFF sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-PDC_STATUS sy-vline 
WA_WSTI_INV_DOC_HEAD_SC_STR-PDC_STATUS_TOOLTIP sy-vline      INTO ld_text SEPARATED BY SPACE.

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