ABAP Select data from SAP table WSTI_INV_DOC_CREATE_CONTROL 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_CREATE_CONTROL 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_CREATE_CONTROL. 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_CREATE_CONTROL 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_CREATE_CONTROL TYPE STANDARD TABLE OF WSTI_INV_DOC_CREATE_CONTROL,
      WA_WSTI_INV_DOC_CREATE_CONTROL TYPE WSTI_INV_DOC_CREATE_CONTROL,
      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_CREATE_CONTROL> TYPE WSTI_INV_DOC_CREATE_CONTROL.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSTI_INV_DOC_CREATE_CONTROL
*  INTO TABLE @DATA(IT_WSTI_INV_DOC_CREATE_CONTROL2).
*--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_CREATE_CONTROL INDEX 1 INTO DATA(WA_WSTI_INV_DOC_CREATE_CONTROL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSTI_INV_DOC_CREATE_CONTROL>-WERKS = 1.
<WSTI_INV_DOC_CREATE_CONTROL>-LGORT = 1.
<WSTI_INV_DOC_CREATE_CONTROL>-MATNR_LOW = 1.
<WSTI_INV_DOC_CREATE_CONTROL>-MATNR_HIGH = 1.
<WSTI_INV_DOC_CREATE_CONTROL>-MATKL_LOW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSTI_INV_DOC_CREATE_CONTROL-MATKL_HIGH, sy-vline,
  WA_WSTI_INV_DOC_CREATE_CONTROL-CLASS_LOW, sy-vline,
  WA_WSTI_INV_DOC_CREATE_CONTROL-CLASS_HIGH, sy-vline,
  WA_WSTI_INV_DOC_CREATE_CONTROL-KDAUF_LOW, sy-vline,
  WA_WSTI_INV_DOC_CREATE_CONTROL-KDAUF_HIGH, sy-vline,
  WA_WSTI_INV_DOC_CREATE_CONTROL-INVNU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSTI_INV_DOC_CREATE_CONTROL 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_CREATE_CONTROL 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_CREATE_CONTROL INTO WA_WSTI_INV_DOC_CREATE_CONTROL.


*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 MATN1, internal->external for field MATNR_LOW
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WSTI_INV_DOC_CREATE_CONTROL-MATNR_LOW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTI_INV_DOC_CREATE_CONTROL-MATNR_LOW.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit ALPHA, internal->external for field LIFNR_HIGH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WSTI_INV_DOC_CREATE_CONTROL-LIFNR_HIGH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTI_INV_DOC_CREATE_CONTROL-LIFNR_HIGH.
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_WSTI_INV_DOC_CREATE_CONTROL_STR, 
WERKS TYPE STRING,
LGORT TYPE STRING,
MATNR_LOW TYPE STRING,
MATNR_HIGH TYPE STRING,
MATKL_LOW TYPE STRING,
MATKL_HIGH TYPE STRING,
CLASS_LOW TYPE STRING,
CLASS_HIGH TYPE STRING,
KDAUF_LOW TYPE STRING,
KDAUF_HIGH TYPE STRING,
INVNU TYPE STRING,
GIDAT_CHAR TYPE STRING,
GIDAT TYPE STRING,
X_WGREIN TYPE STRING,
X_ENABLE_REFR TYPE STRING,
X_ENABLE_CREA TYPE STRING,
X_ENABLE_AUFL TYPE STRING,
NUM_MATERIALS TYPE STRING,
NUM_DOCUMENTS TYPE STRING,
SEL_CHANGED TYPE STRING,
OKCODE_100 TYPE STRING,
SCREEN TYPE STRING,
SORT TYPE STRING,
SAPGUI TYPE STRING,
FURTHER_SELECTION TYPE STRING,
STOCKTYPE TYPE STRING,
WXWART TYPE STRING,
STOP TYPE STRING,
ITEM_ERROR TYPE STRING,
XVKBW TYPE STRING,
SHOW_700 TYPE STRING,
WROW TYPE STRING,
CHECK_MATERIALS TYPE STRING,
ACTION TYPE STRING,
WSTATUS TYPE STRING,
SOBKZ TYPE STRING,
MESSAGE TYPE STRING,
START_FLAG TYPE STRING,
SENDING_ALLOWED TYPE STRING,
SORTTYP TYPE STRING,
MAXPO TYPE STRING,
ITEM_INDEX TYPE STRING,
METHOD TYPE STRING,
INSTANCE_HANDLE TYPE STRING,
LIFNR_LOW TYPE STRING,
LIFNR_HIGH TYPE STRING,
CHARG_EXISTS TYPE STRING,
SOBKZ_E_EXISTS TYPE STRING,
SOBKZ_K_EXISTS TYPE STRING,
NUM_MATERIALS_SEL TYPE STRING,
NUM_STGE_LOC TYPE STRING,
MATID_VS TYPE STRING,
DESCR_VS TYPE STRING,
POWL_ITEM TYPE STRING,
IBLTXT TYPE STRING,
LGORT_LOW TYPE STRING,
LGORT_HIGH TYPE STRING,
LGORT_SELOPT TYPE STRING,
ALV_TBAR_ACTIVATION TYPE STRING,
BP_VERSION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSTI_INV_DOC_CREATE_CONTROL_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_CREATE_CONTROL_STR-WERKS sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-LGORT sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-MATNR_LOW sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-MATNR_HIGH sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-MATKL_LOW sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-MATKL_HIGH sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-CLASS_LOW sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-CLASS_HIGH sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-KDAUF_LOW sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-KDAUF_HIGH sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-INVNU sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-GIDAT_CHAR sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-GIDAT sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-X_WGREIN sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-X_ENABLE_REFR sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-X_ENABLE_CREA sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-X_ENABLE_AUFL sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-NUM_MATERIALS sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-NUM_DOCUMENTS sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-SEL_CHANGED sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-OKCODE_100 sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-SCREEN sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-SORT sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-SAPGUI sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-FURTHER_SELECTION sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-STOCKTYPE sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-WXWART sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-STOP sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-ITEM_ERROR sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-XVKBW sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-SHOW_700 sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-WROW sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-CHECK_MATERIALS sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-ACTION sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-WSTATUS sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-SOBKZ sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-MESSAGE sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-START_FLAG sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-SENDING_ALLOWED sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-SORTTYP sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-MAXPO sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-ITEM_INDEX sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-METHOD sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-INSTANCE_HANDLE sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-LIFNR_LOW sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-LIFNR_HIGH sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-CHARG_EXISTS sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-SOBKZ_E_EXISTS sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-SOBKZ_K_EXISTS sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-NUM_MATERIALS_SEL sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-NUM_STGE_LOC sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-MATID_VS sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-DESCR_VS sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-POWL_ITEM sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-IBLTXT sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-LGORT_LOW sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-LGORT_HIGH sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-LGORT_SELOPT sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-ALV_TBAR_ACTIVATION sy-vline 
WA_WSTI_INV_DOC_CREATE_CONTROL_STR-BP_VERSION sy-vline      INTO ld_text SEPARATED BY SPACE.

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