ABAP Select data from SAP table RNWAT_EDI_INVPOS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNWAT_EDI_INVPOS
*  INTO TABLE @DATA(IT_RNWAT_EDI_INVPOS2).
*--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_RNWAT_EDI_INVPOS INDEX 1 INTO DATA(WA_RNWAT_EDI_INVPOS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNWAT_EDI_INVPOS>-POSNR = 1.
<RNWAT_EDI_INVPOS>-LFDNR = 1.
<RNWAT_EDI_INVPOS>-LNRLS = 1.
<RNWAT_EDI_INVPOS>-ERBART = 1.
<RNWAT_EDI_INVPOS>-PERNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNWAT_EDI_INVPOS-SEQNR, sy-vline,
  WA_RNWAT_EDI_INVPOS-IBGDT, sy-vline,
  WA_RNWAT_EDI_INVPOS-IENDT, sy-vline,
  WA_RNWAT_EDI_INVPOS-LEIST, sy-vline,
  WA_RNWAT_EDI_INVPOS-TARIF, sy-vline,
  WA_RNWAT_EDI_INVPOS-LEITXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNWAT_EDI_INVPOS 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_RNWAT_EDI_INVPOS 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_RNWAT_EDI_INVPOS INTO WA_RNWAT_EDI_INVPOS.


*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 LNRLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWAT_EDI_INVPOS-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWAT_EDI_INVPOS-LNRLS.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field TARIF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWAT_EDI_INVPOS-TARIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWAT_EDI_INVPOS-TARIF.
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_RNWAT_EDI_INVPOS_STR, 
POSNR TYPE STRING,
LFDNR TYPE STRING,
LNRLS TYPE STRING,
ERBART TYPE STRING,
PERNR TYPE STRING,
SEQNR TYPE STRING,
IBGDT TYPE STRING,
IENDT TYPE STRING,
LEIST TYPE STRING,
TARIF TYPE STRING,
LEITXT TYPE STRING,
VARTCODE TYPE STRING,
VARTBEZ TYPE STRING,
FKIMG TYPE STRING,
PREIS TYPE STRING,
BETR TYPE STRING,
POSVAN TYPE STRING,
BAHINWEIS TYPE STRING,
FLG_NTPZ_CONV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNWAT_EDI_INVPOS_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_RNWAT_EDI_INVPOS_STR-POSNR sy-vline 
WA_RNWAT_EDI_INVPOS_STR-LFDNR sy-vline 
WA_RNWAT_EDI_INVPOS_STR-LNRLS sy-vline 
WA_RNWAT_EDI_INVPOS_STR-ERBART sy-vline 
WA_RNWAT_EDI_INVPOS_STR-PERNR sy-vline 
WA_RNWAT_EDI_INVPOS_STR-SEQNR sy-vline 
WA_RNWAT_EDI_INVPOS_STR-IBGDT sy-vline 
WA_RNWAT_EDI_INVPOS_STR-IENDT sy-vline 
WA_RNWAT_EDI_INVPOS_STR-LEIST sy-vline 
WA_RNWAT_EDI_INVPOS_STR-TARIF sy-vline 
WA_RNWAT_EDI_INVPOS_STR-LEITXT sy-vline 
WA_RNWAT_EDI_INVPOS_STR-VARTCODE sy-vline 
WA_RNWAT_EDI_INVPOS_STR-VARTBEZ sy-vline 
WA_RNWAT_EDI_INVPOS_STR-FKIMG sy-vline 
WA_RNWAT_EDI_INVPOS_STR-PREIS sy-vline 
WA_RNWAT_EDI_INVPOS_STR-BETR sy-vline 
WA_RNWAT_EDI_INVPOS_STR-POSVAN sy-vline 
WA_RNWAT_EDI_INVPOS_STR-BAHINWEIS sy-vline 
WA_RNWAT_EDI_INVPOS_STR-FLG_NTPZ_CONV sy-vline      INTO ld_text SEPARATED BY SPACE.

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