ABAP Select data from SAP table MEREQ_ITEM_S_CUST_ALLOWED into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEREQ_ITEM_S_CUST_ALLOWED
*  INTO TABLE @DATA(IT_MEREQ_ITEM_S_CUST_ALLOWED2).
*--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_MEREQ_ITEM_S_CUST_ALLOWED INDEX 1 INTO DATA(WA_MEREQ_ITEM_S_CUST_ALLOWED2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEREQ_ITEM_S_CUST_ALLOWED>-MEREQITEMDUMMY = 1.
<MEREQ_ITEM_S_CUST_ALLOWED>-AFNAM = 1.
<MEREQ_ITEM_S_CUST_ALLOWED>-BEDNR = 1.
<MEREQ_ITEM_S_CUST_ALLOWED>-EKGRP = 1.
<MEREQ_ITEM_S_CUST_ALLOWED>-TXZ01 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEREQ_ITEM_S_CUST_ALLOWED-MATNR, sy-vline,
  WA_MEREQ_ITEM_S_CUST_ALLOWED-EMATN, sy-vline,
  WA_MEREQ_ITEM_S_CUST_ALLOWED-WERKS, sy-vline,
  WA_MEREQ_ITEM_S_CUST_ALLOWED-LGORT, sy-vline,
  WA_MEREQ_ITEM_S_CUST_ALLOWED-MATKL, sy-vline,
  WA_MEREQ_ITEM_S_CUST_ALLOWED-RESWK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEREQ_ITEM_S_CUST_ALLOWED 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_MEREQ_ITEM_S_CUST_ALLOWED 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_MEREQ_ITEM_S_CUST_ALLOWED INTO WA_MEREQ_ITEM_S_CUST_ALLOWED.


*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_MEREQ_ITEM_S_CUST_ALLOWED-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_ITEM_S_CUST_ALLOWED-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_ITEM_S_CUST_ALLOWED-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_ITEM_S_CUST_ALLOWED-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MFRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_ITEM_S_CUST_ALLOWED-MFRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_ITEM_S_CUST_ALLOWED-MFRNR.
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_MEREQ_ITEM_S_CUST_ALLOWED_STR, 
MEREQITEMDUMMY TYPE STRING,
AFNAM TYPE STRING,
BEDNR TYPE STRING,
EKGRP TYPE STRING,
TXZ01 TYPE STRING,
MATNR TYPE STRING,
EMATN TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
MATKL TYPE STRING,
RESWK TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
BUMNG TYPE STRING,
BADAT TYPE STRING,
LPEIN TYPE STRING,
LFDAT TYPE STRING,
FRGDT TYPE STRING,
WEBAZ TYPE STRING,
PREIS TYPE STRING,
PEINH TYPE STRING,
PSTYP TYPE STRING,
KNTTP TYPE STRING,
VRTKZ TYPE STRING,
TWRKZ TYPE STRING,
WEPOS TYPE STRING,
WEUNB TYPE STRING,
REPOS TYPE STRING,
LIFNR TYPE STRING,
FLIEF TYPE STRING,
EKORG TYPE STRING,
VRTYP TYPE STRING,
KONNR TYPE STRING,
KTPNR TYPE STRING,
INFNR TYPE STRING,
ZUGBA TYPE STRING,
DISPO TYPE STRING,
SERNR TYPE STRING,
BWTAR TYPE STRING,
EBAKZ TYPE STRING,
FIXKZ TYPE STRING,
BMEIN TYPE STRING,
REVLV TYPE STRING,
BPUEB TYPE STRING,
WAERS TYPE STRING,
IDNLF TYPE STRING,
SPRAS TYPE STRING,
MFRPN TYPE STRING,
MFRNR TYPE STRING,
EMNFR TYPE STRING,
BERID TYPE STRING,
BESWK TYPE STRING,
MWSKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEREQ_ITEM_S_CUST_ALLOWED_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_MEREQ_ITEM_S_CUST_ALLOWED_STR-MEREQITEMDUMMY sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-AFNAM sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-BEDNR sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-EKGRP sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-TXZ01 sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-MATNR sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-EMATN sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-WERKS sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-LGORT sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-MATKL sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-RESWK sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-MENGE sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-MEINS sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-BUMNG sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-BADAT sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-LPEIN sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-LFDAT sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-FRGDT sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-WEBAZ sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-PREIS sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-PEINH sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-PSTYP sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-KNTTP sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-VRTKZ sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-TWRKZ sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-WEPOS sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-WEUNB sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-REPOS sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-LIFNR sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-FLIEF sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-EKORG sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-VRTYP sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-KONNR sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-KTPNR sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-INFNR sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-ZUGBA sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-DISPO sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-SERNR sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-BWTAR sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-EBAKZ sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-FIXKZ sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-BMEIN sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-REVLV sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-BPUEB sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-WAERS sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-IDNLF sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-SPRAS sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-MFRPN sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-MFRNR sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-EMNFR sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-BERID sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-BESWK sy-vline 
WA_MEREQ_ITEM_S_CUST_ALLOWED_STR-MWSKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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