Error in this application

Question

can any one clarify my doubt .... i am getting an error saying that " LFA1-LIFNR" IS UNKNOWN.
but that is there in that table... i am sending u the report coding also.... reply me soon.
REPORT  Z_SB_VENDORREPORT
        NO STANDARD PAGE HEADING
        MESSAGE-ID ZLANCO
        LINE-SIZE 120
        LINE-COUNT 30(2).
TABLES DELARATIONS *
TABLES: LFA1,
        LFM1.
INTERNAL TABLE DECLARATION *
DATA: BEGIN OF ITAB OCCURS 10,
      LIFNR LIKE LFA1-LIFNR,  " ACCOUNT NUMBER OF VENDOR OR CREDITOR
      NAME1 LIKE LFA1-NAME1,  " NAME
      LAND1 LIKE LFA1-LAND1,  " COUNTRY KEY
      REGIO LIKE LFA1-REGIO,  " REGION
      ERDAT LIKE LFA1-ERDAT,  " DATE ON WHICH THE RECORD WAS CREATED
      EKORG LIKE LFM1-EKORG,  " PURCHASING ORGANIZATION
      WAERS LIKE LFM1-WAERS,  " PURCHASE ORDER CURRENCY
      EKGRP LIKE LFM1-EKGRP,  " PURCHASING GROUP
      MINBW LIKE LFM1-MINBW,  " MINIMUM ORDER VALUE
      END OF ITAB.
SELECTION-SCREEN *
SELECTION-SCREEN BEGIN OF BLOCK BLK WITH FRAME TITLE TEXT-T01.
  SELECT-OPTIONS: SLIFNR FOR LFA1-LIFNR,
                  SEKORG FOR LFM1-EKORG,
                  SEKGRP FOR LFM1-EKGRP.
SELECTION-SCREEN END OF BLOCK BLK.
AT SELECTION-SCREEN *
AT SELECTION-SCREEN.
  SELECT SINGLE * INTO CORRESPONDING FIELDS OF ITAB
         FROM LFA1 WHERE LIFNR = SLIFNR.
  IF SY-SUBRC NE 0.
    MESSAGE I001.
  ENDIF.
TOP-OF-PAGE *
TOP-OF-PAGE.
  WRITE:/40 'VENDOR DETAILS',
        /40(15) SY-ULINE,
        / 'S.NO.',
        10 'LIFNR',
        20 'NAME1',
        35 'EKORG',
        45 'EKGRP',
        55 'LAND1',
        65 'REGIO',
        75 'ERDAT',
        85 'WAERS',
        95 'MINBW'.
START-OF-SELECTION *
START-OF-SELECTION.
  SELECT LFA1-LIFNR
         LFA1-NAME1
         LFM1-EKORG
         LFM1-EKGRP
         LFA1-LAND1
         LFA1-REGIO
         LFA1-ERDAT
         LFM1-WAERS
         LFM1-MINBW
         INTO TABLE ITAB
         FROM LFA1
         INNER JOIN LFM1
         ON LFA1-LIFNR = LFM1-LIFNR.
END-OF-SELECTION *
END-OF-SELECTION.
  LOOP AT ITAB.
    WRITE:/ ITAB-LIFNR UNDER 'LIFNR',
            ITAB-NAME1 UNDER 'NAME1',
            ITAB-EKORG UNDER 'EKORG',
            ITAB-EKGRP UNDER 'EKGRP',
            ITAB-LAND1 UNDER 'LAND1',
            ITAB-REGIO UNDER 'REGIO',
            ITAB-ERDAT UNDER 'ERDAT',
            ITAB-WAERS UNDER 'WAERS',
            ITAB-MINBW UNDER 'MINBW'.
  ENDLOOP.
Thanx & Regards ,
PHANINDER GOLLAPUDI.

Answer 1

STILL I AM GETTING RUN TIME ERROR .. I AM SENDING U THE DETAILS
Runtime Errors         DBIF_RSQL_INVALID_RSQL
Except.                CX_SY_OPEN_SQL_DB
Date and Time          19.09.2007 03:16:22
     Short text
          RSQL error 23 when accessing table "LFA1 ".
     Missing Handling of System Exception
         Program     Z_SB_VENDORREPORT
     Trigger Location of Exception
         Program     Z_SB_VENDORREPORT
         Include     Z_SB_VENDORREPORT
         Row     80
         Module Name     START-OF-SELECTION
     Source Code Extract
     Line     SourceCde
        50       SELECT SINGLE * INTO CORRESPONDING FIELDS OF ITAB
        51              FROM LFA1 WHERE LIFNR = SLIFNR-LOW.
        52     
        53       IF SY-SUBRC NE 0.
        54         MESSAGE I001.
        55       ENDIF.
        56     
        57     ***************
        58     * TOP-OF-PAGE *
        59     ***************
        60     TOP-OF-PAGE.
        61     
        62       WRITE:/40 'VENDOR DETAILS',
        63             /40(15) SY-ULINE,
        64             / 'S.NO.',
        65             10 'LIFNR',
        66             20 'NAME1',
        67             35 'EKORG',
        68             45 'EKGRP',
        69             55 'LAND1',
        70             65 'REGIO',
        71             75 'ERDAT',
        72             85 'WAERS',
        73             95 'MINBW'.
        74     
        75     **********************
        76     * START-OF-SELECTION *
        77     **********************
        78     START-OF-SELECTION.
        79     
     >>>>>       SELECT LFA1~LIFNR
        81              LFA1~NAME1
        82              LFM1~EKORG
        83              LFM1~EKGRP
        84              LFA1~LAND1
        85              LFA1~REGIO
        86              LFA1~ERDAT
        87              LFM1~WAERS
        88              LFM1~MINBW
        89              INTO TABLE ITAB
        90              FROM LFA1
        91              INNER JOIN LFM1
        92              ON LFA1LIFNR = LFM1LIFNR
        93              WHERE LFA1~LIFNR IN SLIFNR.
        94     
        95     ********************
        96     * END-OF-SELECTION *
        97     ********************
        98     END-OF-SELECTION.
        99