ABAP Select data from SAP table /ISDFPS/ST_REL_LFB_GEN_DOCS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /ISDFPS/ST_REL_LFB_GEN_DOCS 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 /ISDFPS/ST_REL_LFB_GEN_DOCS. 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 /ISDFPS/ST_REL_LFB_GEN_DOCS 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_/ISDFPS/ST_REL_LFB_GEN_DOCS TYPE STANDARD TABLE OF /ISDFPS/ST_REL_LFB_GEN_DOCS,
      WA_/ISDFPS/ST_REL_LFB_GEN_DOCS TYPE /ISDFPS/ST_REL_LFB_GEN_DOCS,
      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: </ISDFPS/ST_REL_LFB_GEN_DOCS> TYPE /ISDFPS/ST_REL_LFB_GEN_DOCS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ISDFPS/ST_REL_LFB_GEN_DOCS
*  INTO TABLE @DATA(IT_/ISDFPS/ST_REL_LFB_GEN_DOCS2).
*--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_/ISDFPS/ST_REL_LFB_GEN_DOCS INDEX 1 INTO DATA(WA_/ISDFPS/ST_REL_LFB_GEN_DOCS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ISDFPS/ST_REL_LFB_GEN_DOCS>-RELOC_ID = 1.
</ISDFPS/ST_REL_LFB_GEN_DOCS>-RELOC_SEQ_ID = 1.
</ISDFPS/ST_REL_LFB_GEN_DOCS>-FORCE_ID = 1.
</ISDFPS/ST_REL_LFB_GEN_DOCS>-FORCE_CNT = 1.
</ISDFPS/ST_REL_LFB_GEN_DOCS>-STEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-CRD_DATE, sy-vline,
  WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-FORCEM_CNT, sy-vline,
  WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-MATNR, sy-vline,
  WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-MENGE_SOLL, sy-vline,
  WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-MENGE_IST, sy-vline,
  WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-MEINS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ISDFPS/ST_REL_LFB_GEN_DOCS 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_/ISDFPS/ST_REL_LFB_GEN_DOCS 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_/ISDFPS/ST_REL_LFB_GEN_DOCS INTO WA_/ISDFPS/ST_REL_LFB_GEN_DOCS.


*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
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GERNR, internal->external for field SERNR
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-SERNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-SERNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-PSPNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field VBELN_VL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-VBELN_VL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ST_REL_LFB_GEN_DOCS-VBELN_VL.
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_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR, 
RELOC_ID TYPE STRING,
RELOC_SEQ_ID TYPE STRING,
FORCE_ID TYPE STRING,
FORCE_CNT TYPE STRING,
STEXT TYPE STRING,
CRD_DATE TYPE STRING,
FORCEM_CNT TYPE STRING,
MATNR TYPE STRING,
MENGE_SOLL TYPE STRING,
MENGE_IST TYPE STRING,
MEINS TYPE STRING,
SERNR TYPE STRING,
BATCH TYPE STRING,
PSPNR TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
VBELN_VL TYPE STRING,
POSNR TYPE STRING,
PNGUID TYPE STRING,
PNTYPE_AS_ICON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_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_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-RELOC_ID sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-RELOC_SEQ_ID sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-FORCE_ID sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-FORCE_CNT sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-STEXT sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-CRD_DATE sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-FORCEM_CNT sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-MATNR sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-MENGE_SOLL sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-MENGE_IST sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-MEINS sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-SERNR sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-BATCH sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-PSPNR sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-EBELN sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-EBELP sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-VBELN_VL sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-POSNR sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-PNGUID sy-vline 
WA_/ISDFPS/ST_REL_LFB_GEN_DOCS_STR-PNTYPE_AS_ICON sy-vline      INTO ld_text SEPARATED BY SPACE.

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