ometimes you want to use an ALV Grid directly as output in a report (not a Dynpro).

The magic function to this is:

**ALVGrid 
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      IT_FIELDCAT   = L_IT_FIELDCAT
      I_GRID_TITLE  = L_VAR_TITLE
    TABLES
      T_OUTTAB      = <L_VAR_OUTTAB>
    EXCEPTIONS
      PROGRAM_ERROR = 1
      OTHERS        = 2.
  IF SY-SUBRC <> 0.
    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.

You can generate your Fieldcat wth another Helpful function:
**Generate Fieldcat
  CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
    EXPORTING
      I_PROGRAM_NAME         = SY-CPROG
      I_INTERNAL_TABNAME     = L_VAR_TABNAME
      I_INCLNAME             = SY-CPROG
    CHANGING
      CT_FIELDCAT            = L_IT_FIELDCAT
    EXCEPTIONS
      INCONSISTENT_INTERFACE = 1
      PROGRAM_ERROR          = 2
      OTHERS                 = 3.
  IF SY-SUBRC <> 0.
    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.

As you can see here,the Fieldcat is generated from a local internam table. It is mandatory to give the include the where the table is defined. If the data structure is not in DDIC but local as well you need to give the include where it is defined, or include it in TOP. Very important is, that local structures are only read correctly when defined with LIKE and INCLUDE structure as Datatypes. TYPES and normalINCLUDE wont work, since the ddic information is not read there. Its also written in the Manual of the function. So always RTFM cause i did it way too late ;)

Here a sample as an MBEWH Extension is locally defined:

DATA: BEGIN OF TP_MBEWH_EXTENDED.
" MBEWH
        INCLUDE STRUCTURE MBEWH.
" MARA with Key MATNR
DATA:     YYBEZBE   LIKE  MARA-YYBEZBE,
          MTART     LIKE  MARA-MTART,
          MATKL     LIKE  MARA-MATKL,
          MEINS     LIKE  MARA-MEINS,
"T001 with Key BUKRS from T001K  with Key BWKEY
          WAERS     LIKE  T001-WAERS,
"T023T with Key MATKL
          WGBEZ     LIKE  T023T-WGBEZ.
DATA: END OF TP_MBEWH_EXTENDED.





As Update here is a small piece of Code to dynamically alocate Tables and Fieldcats to 3 different Tables:

FORM BUILD_ALV.

  CHECK P_TABLE IS NOT INITIAL.

  DATA: L_IT_FIELDCAT       TYPE SLIS_T_FIELDCAT_ALV,
        L_VAR_TABNAME       TYPE SLIS_TABNAME,
        L_VAR_TITLE         TYPE LVC_TITLE,
        L_VAR_LINE_CNT_OUT  TYPE C LENGTH 20.

  FIELD-SYMBOLS: <L_VAR_OUTTAB> TYPE STANDARD TABLE.

**Je nach Auwahl der Tabelle wird die Struktur für den Feldkatalog und
* die zugehörige Ergebnis iTab  für das ALV gewählt.
  CASE P_TABLE.
    WHEN 'S31'.
      L_VAR_TABNAME = 'TP_S031_EXTENDED'.
      ASSIGN IT_S031_EXTENDED  TO <L_VAR_OUTTAB>.
    WHEN 'S32'.
      L_VAR_TABNAME = 'TP_S032_EXTENDED'.
      ASSIGN IT_S032_EXTENDED  TO <L_VAR_OUTTAB>.
    WHEN 'MBH'.
      L_VAR_TABNAME = 'TP_MBEWH_EXTENDED'.
      ASSIGN IT_MBEWH_EXTENDED TO <L_VAR_OUTTAB>.
  ENDCASE.

**Feldkatalog schlicht nach Tabelle erstellen
  CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
    EXPORTING
      I_PROGRAM_NAME         = SY-CPROG
      I_INTERNAL_TABNAME     = L_VAR_TABNAME
      I_INCLNAME             = SY-CPROG
    CHANGING
      CT_FIELDCAT            = L_IT_FIELDCAT
    EXCEPTIONS
      INCONSISTENT_INTERFACE = 1
      PROGRAM_ERROR          = 2
      OTHERS                 = 3.
  IF SY-SUBRC <> 0.
    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.

  "Feldkatalog individuelle Sortierung
  CASE P_TABLE.
    WHEN 'S31'.
      PERFORM REORDER_FIELDCAT_S031 CHANGING L_IT_FIELDCAT.
    WHEN 'S32'.
      PERFORM REORDER_FIELDCAT_S032 CHANGING L_IT_FIELDCAT.
    WHEN 'MBH'.
      PERFORM REORDER_FIELDCAT_MBEWH CHANGING L_IT_FIELDCAT.
  ENDCASE.

*Anzahl der Zeilen
  DESCRIBE TABLE <L_VAR_OUTTAB> LINES L_VAR_LINE_CNT_OUT.

***Tabellenname in den Titel nehmen
*  CONCATENATE TEXT-100 L_VAR_TABNAME L_VAR_LINE_CNT_OUT TEXT-101
*      INTO L_VAR_TITLE RESPECTING BLANKS.


**ALVGrid generieren.
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      IT_FIELDCAT   = L_IT_FIELDCAT
      I_GRID_TITLE  = L_VAR_TITLE
    TABLES
      T_OUTTAB      = <L_VAR_OUTTAB>
    EXCEPTIONS
      PROGRAM_ERROR = 1
      OTHERS        = 2.
  IF SY-SUBRC <> 0.
    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.

ENDFORM.                    "DISPLAY_ALV_REPORT



Then at last you might want to reorder the Fieldcat positions in your Output afterwards. Therem ight be better ways to do this (comments welcome), but most of what i tried before was very complicated an not error prone. The problem are some Entry which are also hidden an not seen and mostly have empty Tabnames. So i just went and took the First entry i knew, reordered everything from this Sy-Tabix on forward and renumerated everythin in the end.

 *&---------------------------------------------------------------------*
*&      Form  REORDER_FIELDCAT_MBEWH
*&---------------------------------------------------------------------*
* Feldkatalog anpassungen:
*----------------------------------------------------------------------*
*      <--P_L_IT_FIELDCAT  Feldcatalog zu ändern
*----------------------------------------------------------------------*
FORM REORDER_FIELDCAT_MBEWH CHANGING C_IT_FIELDCAT
                                    TYPE SLIS_T_FIELDCAT_ALV.


  DATA: L_WA_FIELDCAT_TMP TYPE SLIS_FIELDCAT_ALV,
        L_VAR_TABIX       TYPE SY-INDEX,
        L_VAR_COL_POS_CNT TYPE I VALUE 1.

  FIELD-SYMBOLS <FS_WA_FIELDCAT_POS> TYPE SLIS_FIELDCAT_ALV.

  "Index der Material Spalte lesen (MATNR)
  READ TABLE  C_IT_FIELDCAT
           WITH KEY FIELDNAME = 'MATNR' TRANSPORTING NO FIELDS.
  L_VAR_TABIX = SY-TABIX + 1 .

  "WGBEZ
  READ TABLE  C_IT_FIELDCAT
            INTO L_WA_FIELDCAT_TMP
            WITH KEY FIELDNAME = 'WGBEZ'.
  IF SY-SUBRC = 0.
    "Löschen und neu einfügen
    DELETE C_IT_FIELDCAT
        WHERE FIELDNAME = 'WGBEZ'.
    INSERT L_WA_FIELDCAT_TMP  INTO C_IT_FIELDCAT INDEX L_VAR_TABIX.
  ENDIF.

  "MATKL verschieben
  READ TABLE  C_IT_FIELDCAT
              INTO L_WA_FIELDCAT_TMP
              WITH KEY FIELDNAME = 'MATKL'.
  IF SY-SUBRC = 0.
    "Löschen und neu einfügen
    DELETE C_IT_FIELDCAT
        WHERE FIELDNAME = 'MATKL'.
    INSERT L_WA_FIELDCAT_TMP  INTO C_IT_FIELDCAT INDEX L_VAR_TABIX.
  ENDIF.

  "MTART
  READ TABLE  C_IT_FIELDCAT
            INTO L_WA_FIELDCAT_TMP
            WITH KEY FIELDNAME = 'MTART'.
  IF SY-SUBRC = 0.
    "Löschen und neu einfügen
    DELETE C_IT_FIELDCAT
        WHERE FIELDNAME = 'MTART'.
    INSERT L_WA_FIELDCAT_TMP  INTO C_IT_FIELDCAT INDEX L_VAR_TABIX.
  ENDIF.

  "MAKTX
  READ TABLE  C_IT_FIELDCAT
            INTO  L_WA_FIELDCAT_TMP
            WITH KEY FIELDNAME = 'MAKTX'.
  IF SY-SUBRC = 0.
    "Löschen und neu einfügen
    DELETE C_IT_FIELDCAT
        WHERE FIELDNAME = 'MAKTX'.
    INSERT L_WA_FIELDCAT_TMP  INTO C_IT_FIELDCAT INDEX L_VAR_TABIX.
  ENDIF.



  "Index der Periode Spalte lesen (LFMON)
  READ TABLE  C_IT_FIELDCAT
           WITH KEY FIELDNAME = 'LFMON' TRANSPORTING NO FIELDS.
  L_VAR_TABIX = SY-TABIX + 1 .

  "WAERS
  READ TABLE  C_IT_FIELDCAT
            INTO L_WA_FIELDCAT_TMP
            WITH KEY FIELDNAME = 'WAERS'.
  IF SY-SUBRC = 0.
    "Löschen und neu einfügen
    DELETE C_IT_FIELDCAT
        WHERE FIELDNAME = 'WAERS'.
    INSERT L_WA_FIELDCAT_TMP  INTO C_IT_FIELDCAT INDEX L_VAR_TABIX.
  ENDIF.

  "MEINS
  READ TABLE  C_IT_FIELDCAT
            INTO  L_WA_FIELDCAT_TMP
            WITH KEY FIELDNAME = 'MEINS'.
  IF SY-SUBRC = 0.
    "Löschen und neu einfügen
    DELETE C_IT_FIELDCAT
        WHERE FIELDNAME = 'MEINS'.
    INSERT L_WA_FIELDCAT_TMP  INTO C_IT_FIELDCAT INDEX L_VAR_TABIX.
  ENDIF.

  "Positionen neu schreiben
  LOOP AT C_IT_FIELDCAT ASSIGNING <FS_WA_FIELDCAT_POS>
     WHERE TABNAME NE ''.
    <FS_WA_FIELDCAT_POS>-COL_POS = L_VAR_COL_POS_CNT.
    L_VAR_COL_POS_CNT = L_VAR_COL_POS_CNT + 1.
  ENDLOOP.

ENDFORM.                    " REORDER_FIELDCAT_MBEWH 



Serkan AKKAVAK
Computer Engineer
ABAP Developer & SAP S/4 HANA Logistics Team Lead
Contact : serkurumsal@yandex.com