ABAP Select data from SAP table FMR_ALV_ERLK1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP FMR_ALV_ERLK1 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 FMR_ALV_ERLK1. 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 FMR_ALV_ERLK1 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_FMR_ALV_ERLK1 TYPE STANDARD TABLE OF FMR_ALV_ERLK1,
      WA_FMR_ALV_ERLK1 TYPE FMR_ALV_ERLK1,
      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: <FMR_ALV_ERLK1> TYPE FMR_ALV_ERLK1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_FMR_ALV_ERLK1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM FMR_ALV_ERLK1
  INTO TABLE IT_FMR_ALV_ERLK1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FMR_ALV_ERLK1
*  INTO TABLE @DATA(IT_FMR_ALV_ERLK12).
*--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_FMR_ALV_ERLK1 INDEX 1 INTO DATA(WA_FMR_ALV_ERLK12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_FMR_ALV_ERLK1 ASSIGNING <FMR_ALV_ERLK1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FMR_ALV_ERLK1>-XMARK = 1.
<FMR_ALV_ERLK1>-BELNR = 1.
<FMR_ALV_ERLK1>-BLPOS = 1.
<FMR_ALV_ERLK1>-BLTYP = 1.
<FMR_ALV_ERLK1>-BLART = 1.

ENDLOOP.

LOOP AT IT_FMR_ALV_ERLK1 INTO WA_FMR_ALV_ERLK1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FMR_ALV_ERLK1-BLDAT, sy-vline,
  WA_FMR_ALV_ERLK1-BUDAT, sy-vline,
  WA_FMR_ALV_ERLK1-BUKRS, sy-vline,
  WA_FMR_ALV_ERLK1-KERFAS, sy-vline,
  WA_FMR_ALV_ERLK1-KTEXT, sy-vline,
  WA_FMR_ALV_ERLK1-WAERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FMR_ALV_ERLK1 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_FMR_ALV_ERLK1 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_FMR_ALV_ERLK1 INTO WA_FMR_ALV_ERLK1.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit FMCIS, internal->external for field FIPOS
CALL FUNCTION 'CONVERSION_EXIT_FMCIS_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-FIPOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-FIPOS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SAKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-SAKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-SAKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-PSPNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-AUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PS_PSP_PNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-PS_PSP_PNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-PS_PSP_PNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NPLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-NPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-NPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK1-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK1-KOSTL.
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_FMR_ALV_ERLK1_STR, 
XMARK TYPE STRING,
BELNR TYPE STRING,
BLPOS TYPE STRING,
BLTYP TYPE STRING,
BLART TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
BUKRS TYPE STRING,
KERFAS TYPE STRING,
KTEXT TYPE STRING,
WAERS TYPE STRING,
HWAER TYPE STRING,
WTFREE TYPE STRING,
HWFREE TYPE STRING,
WTGES TYPE STRING,
HWGES TYPE STRING,
FDATK TYPE STRING,
PTEXT TYPE STRING,
FIPOS TYPE STRING,
FISTL TYPE STRING,
BUDGET_PD TYPE STRING,
GEBER TYPE STRING,
SAKNR TYPE STRING,
PSPNR TYPE STRING,
AUFNR TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,
PS_PSP_PNR TYPE STRING,
NPLNR TYPE STRING,
VORNR TYPE STRING,
LIFNR TYPE STRING,
KUNNR TYPE STRING,
EF_GROUP_NUMBER TYPE STRING,
KOSTL TYPE STRING,
DELTAWTAPP TYPE STRING,
DELTAHWAPP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FMR_ALV_ERLK1_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_FMR_ALV_ERLK1_STR-XMARK sy-vline 
WA_FMR_ALV_ERLK1_STR-BELNR sy-vline 
WA_FMR_ALV_ERLK1_STR-BLPOS sy-vline 
WA_FMR_ALV_ERLK1_STR-BLTYP sy-vline 
WA_FMR_ALV_ERLK1_STR-BLART sy-vline 
WA_FMR_ALV_ERLK1_STR-BLDAT sy-vline 
WA_FMR_ALV_ERLK1_STR-BUDAT sy-vline 
WA_FMR_ALV_ERLK1_STR-BUKRS sy-vline 
WA_FMR_ALV_ERLK1_STR-KERFAS sy-vline 
WA_FMR_ALV_ERLK1_STR-KTEXT sy-vline 
WA_FMR_ALV_ERLK1_STR-WAERS sy-vline 
WA_FMR_ALV_ERLK1_STR-HWAER sy-vline 
WA_FMR_ALV_ERLK1_STR-WTFREE sy-vline 
WA_FMR_ALV_ERLK1_STR-HWFREE sy-vline 
WA_FMR_ALV_ERLK1_STR-WTGES sy-vline 
WA_FMR_ALV_ERLK1_STR-HWGES sy-vline 
WA_FMR_ALV_ERLK1_STR-FDATK sy-vline 
WA_FMR_ALV_ERLK1_STR-PTEXT sy-vline 
WA_FMR_ALV_ERLK1_STR-FIPOS sy-vline 
WA_FMR_ALV_ERLK1_STR-FISTL sy-vline 
WA_FMR_ALV_ERLK1_STR-BUDGET_PD sy-vline 
WA_FMR_ALV_ERLK1_STR-GEBER sy-vline 
WA_FMR_ALV_ERLK1_STR-SAKNR sy-vline 
WA_FMR_ALV_ERLK1_STR-PSPNR sy-vline 
WA_FMR_ALV_ERLK1_STR-AUFNR sy-vline 
WA_FMR_ALV_ERLK1_STR-AUFPL sy-vline 
WA_FMR_ALV_ERLK1_STR-APLZL sy-vline 
WA_FMR_ALV_ERLK1_STR-PS_PSP_PNR sy-vline 
WA_FMR_ALV_ERLK1_STR-NPLNR sy-vline 
WA_FMR_ALV_ERLK1_STR-VORNR sy-vline 
WA_FMR_ALV_ERLK1_STR-LIFNR sy-vline 
WA_FMR_ALV_ERLK1_STR-KUNNR sy-vline 
WA_FMR_ALV_ERLK1_STR-EF_GROUP_NUMBER sy-vline 
WA_FMR_ALV_ERLK1_STR-KOSTL sy-vline 
WA_FMR_ALV_ERLK1_STR-DELTAWTAPP sy-vline 
WA_FMR_ALV_ERLK1_STR-DELTAHWAPP sy-vline      INTO ld_text SEPARATED BY SPACE.

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