Hi, Please let me know why the output is not displayed ?This is ALV report for sales order.

REPORT ZALV_REPORT_PROJ.
TYPE-POOLS: SLIS.
TABLES VBRK.
TABLES VBRP.
TABLES LIPS.

TYPES: BEGIN OF VBRK,
        VBELN TYPE VBRK-VBELN,
        FKDAT TYPE VBRK-FKDAT,
        KUNRG TYPE VBRK-KUNRG,
       END OF VBRK.

TYPES: BEGIN OF VBRP,
        VBELN TYPE VBRP-VBELN,
        FKLMG TYPE VBRP-FKLMG,
        MATNR TYPE VBRP-MATNR,
        ARKTX TYPE VBRP-ARKTX,
        WERKS TYPE VBRP-WERKS,
       END OF VBRP.

TYPES: BEGIN OF LIPS,
        VBELN1 TYPE LIPS-VBELN,
        ERDAT TYPE LIPS-ERDAT,
        LFIMG TYPE LIPS-LFIMG,
       END OF LIPS.

TYPES: BEGIN OF SALES,
        VBELN TYPE VBRK-VBELN,
        FKDAT TYPE VBRK-FKDAT,
        KUNRG TYPE VBRK-KUNRG,
        FKLMG TYPE VBRP-FKLMG,
        MATNR TYPE VBRP-MATNR,
        ARKTX TYPE VBRP-ARKTX,
        WERKS TYPE VBRP-WERKS,
        VBELN1 TYPE LIPS-VBELN1,
        ERDAT TYPE LIPS-ERDAT,
        LFIMG TYPE LIPS-LFIMG,
      END OF SALES.

DATA: ISALES TYPE TABLE OF SALES,
      WA_SALES TYPE SALES.
DATA: MSEG TYPE MSEG-ERFMG.

DATA: IVBRK TYPE TABLE OF VBRK,
      WA_VBRK TYPE VBRK.

DATA: IVBRP TYPE TABLE OF VBRP,
      WA_VBRP TYPE VBRP.

DATA: ILIPS TYPE TABLE OF LIPS,
      WA_LIPS TYPE LIPS.

DATA: I_FCAT TYPE SLIS_T_FIELDCAT_ALV,
      WA_FCAT LIKE LINE OF I_FCAT.
DATA: DIFF TYPE I.

SELECT-OPTIONS SUPPL FOR VBRP-WERKS.
SELECT-OPTIONS RECV FOR VBRK-KUNAG.
SELECT-OPTIONS MATERIAL FOR VBRP-MATNR.
SELECT-OPTIONS INVOICE FOR VBRK-FKDAT.

START-OF-SELECTION.
PERFORM GET_DATA.
PERFORM CREATE_FCAT.
PERFORM DISPLAY.

FORM GET_DATA.

SELECT * FROM VBRK INTO CORRESPONDING FIELDS OF TABLE IVBRK
  WHERE KUNAG IN RECV AND FKDAT IN MATERIAL.

  IF NOT IVBRK IS INITIAL.
    SELECT * FROM VBRP INTO CORRESPONDING FIELDS OF TABLE IVBRP
      FOR ALL ENTRIES IN IVBRK WHERE VBELN = IVBRK-VBELN AND WERKS IN SUPPL AND MATNR IN MATERIAL.
  ENDIF.

      IF NOT IVBRP IS INITIAL.
        SELECT * FROM LIPS INTO CORRESPONDING FIELDS OF TABLE ILIPS
          FOR ALL ENTRIES IN IVBRP WHERE VBELN = IVBRP-VBELN.
      ENDIF.

ENDFORM.

FORM DISPLAY.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
 EXPORTING
   I_CALLBACK_PROGRAM                = 'SY-REPID'
   IT_FIELDCAT                       = I_FCAT
  TABLES
    T_OUTTAB                          = ISALES
 EXCEPTIONS
   PROGRAM_ERROR                     = 1
   OTHERS                            = 2.
ENDFORM.

FORM CREATE_FCAT.
  WA_FCAT-COL_POS = '1'.
  WA_FCAT-FIELDNAME = 'VBELN'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'INVOICE NUMBER'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '2'.
  WA_FCAT-FIELDNAME = 'FKDATE'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'INVOICE DATE'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '3'.
  WA_FCAT-FIELDNAME = 'MATNR'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'MATERIAL CODE'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '4'.
  WA_FCAT-FIELDNAME = 'ARKTX'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_L = 'MATERIAL DESCRIPTION'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '5'.
  WA_FCAT-FIELDNAME = 'FKIMG'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'INVOICE QTY'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '6'.
  WA_FCAT-FIELDNAME = 'WERKS'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'SHIPPING PLANT'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '7'.
  WA_FCAT-FIELDNAME = 'KUNAG'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'RECEIVING PLANT'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '8'.
  WA_FCAT-FIELDNAME = 'ERDAT'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'GATE IN DATE'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '9'.
  WA_FCAT-FIELDNAME = 'VEBLN1'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'GATE ENTRY NO'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '10'.
  WA_FCAT-FIELDNAME = 'LFIMG'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'GATE ENTRY QTY'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '11'.
  WA_FCAT-FIELDNAME = 'BUDAT_MKPF'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'GRN DATE'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '12'.
  WA_FCAT-FIELDNAME = 'MSEG'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'GRN NUMBER'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  WA_FCAT-COL_POS = '14'.
  WA_FCAT-FIELDNAME = 'MSEG'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_m = 'GRN QTY'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  DIFF = LIPS-LFIMG - MSEG.

  WA_FCAT-COL_POS = '15'.
  WA_FCAT-FIELDNAME = 'DIFF'.
  WA_FCAT-TABNAME = 'ISALES'.
  WA_FCAT-SELTEXT_L = 'DIFFERENCE INVOICES VS GRN QTY'.
  APPEND WA_FCAT TO I_FCAT.
  CLEAR WA_FCAT.

  LOOP AT I_FCAT INTO WA_FCAT.
*   READ TABLE ISALES INTO WA_SALES WITH KEY VBELN = WA_VBRP-VBELN BINARY SEARCH.
   WA_SALES-VBELN = WA_VBRK-VBELN.
   WA_SALES-FKDAT = WA_VBRK-FKDAT.
   WA_SALES-KUNRG = WA_VBRK-KUNRG.
   WA_SALES-FKLMG = WA_VBRP-FKLMG.
   WA_SALES-MATNR = WA_VBRP-MATNR.
   WA_SALES-ARKTX = WA_VBRP-ARKTX.
   WA_SALES-WERKS = WA_VBRP-WERKS.
   WA_SALES-VBELN1 = WA_LIPS-VBELN1.
   WA_SALES-ERDAT = WA_LIPS-ERDAT.
   WA_SALES-LFIMG = WA_LIPS-lfimg.
   APPEND WA_SALES TO ISALES.
 ENDLOOP.
ENDFORM.