Alv show in report but when see in spool (after run background job) there i

Question

my program have some error when i run result alv show in report but when see in spool (after run background job) there is no data, (other program can see result in spool)
Please help
here is some example of my program
********************************declare internal table*****************************
internal table output for BDC
data : begin of t_output occurs 0,
bukrs type anla-bukrs,
anln1 type anla-anln1,
anln2 type anla-anln2,
zugdt type anla-zugdt,
result(70) type c,
end of t_output.
*****get data from loop********************************
  loop at t_anla.
    CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
         EXPORTING
              INPUT  = t_anla-anln1
         IMPORTING
              OUTPUT = t_anla-anln1.
    CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
         EXPORTING
              INPUT  = t_anla-anln2
         IMPORTING
              OUTPUT = t_anla-anln2.
check record is correct or not
    select single bukrs anln1 anln2 zugdt
    into w_output
    from anla
    where bukrs = t_anla-bukrs and
    anln1 = t_anla-anln1 and
    anln2 = t_anla-anln2
   zugdt = '00000000'
if record is correct
    if sy-subrc = 0 and w_output-zugdt = '00000000'.
      w_output-bukrs = t_anla-bukrs.
      w_output-anln1 = t_anla-anln1.
      w_output-anln2 = t_anla-anln2.
      w_output-result = 'Yes : this asset can delete'.
      append w_output to t_output.
if record is not correct
    elseif sy-subrc = 0 and w_output-zugdt <> '00000000'.
there is error record  this asset have value already
      v_have_error = 'X'.
      w_output-bukrs = t_anla-bukrs.
      w_output-anln1 = t_anla-anln1.
      w_output-anln2 = t_anla-anln2.
      w_output-result = 'Error : this asset have value already'.
      append w_output to t_output.
    else.
there is error record this asset donot exist in table anla
      v_have_error = 'X'.
      w_output-bukrs = t_anla-bukrs.
      w_output-anln1 = t_anla-anln1.
      w_output-anln2 = t_anla-anln2.
      w_output-result = 'Error : this asset doest not exist'.
      append w_output to t_output.
    endif.
*end of check record is correct or not
    clear w_output.
  endloop.
******************************show data in ALV***************************************************
show data from file in ALV
  perform display_report_ALV.
*&      Form  display_report_ALV
form display_report_ALV.
  DATA: LT_FIELD_CAT TYPE SLIS_T_FIELDCAT_ALV,
      LT_EVENTS TYPE SLIS_T_EVENT,
      LV_REPID LIKE SY-REPID.
  PERFORM ALV_DEFINE_FIELD_CAT USING LT_FIELD_CAT.
  PERFORM ALV_HEADER_BUILD USING T_LIST_TOP_OF_PAGE[].
  PERFORM ALV_EVENTTAB_BUILD USING LT_EVENTS[].
  LV_REPID = SY-REPID.
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
       EXPORTING
            I_CALLBACK_PROGRAM = LV_REPID
            IT_FIELDCAT        = LT_FIELD_CAT
            I_SAVE             = 'A'
            IT_EVENTS          = LT_EVENTS[]
       TABLES
            T_OUTTAB           = t_output
       EXCEPTIONS
            PROGRAM_ERROR      = 1
            OTHERS             = 2.
  IF SY-SUBRC NE 0.
    WRITE: / 'Return Code : ', SY-SUBRC,
      'from FUNCTION REUSE_ALV_GRID_DISPLAY'.
  ENDIF.
endform.
*&      Form  alv_define_field_cat
      text
     -->P_LT_FIELD_CAT  text
FORM ALV_DEFINE_FIELD_CAT USING  TB_FCAT TYPE SLIS_T_FIELDCAT_ALV.
  DATA: WA_FIELDCAT LIKE LINE OF TB_FCAT,
    LV_COL_POS TYPE I.
  DEFINE FIELD_CAT.
    CLEAR WA_FIELDCAT.
    ADD 1 TO LV_COL_POS.
    WA_FIELDCAT-FIELDNAME = &1.
    WA_FIELDCAT-REF_TABNAME = &2.
    WA_FIELDCAT-COL_POS = LV_COL_POS.
    WA_FIELDCAT-KEY = &3.
    WA_FIELDCAT-NO_OUT = &4.
    WA_FIELDCAT-REF_FIELDNAME = &5.
    WA_FIELDCAT-DDICTXT = 'M'.
    IF NOT &6 IS INITIAL.
      WA_FIELDCAT-SELTEXT_L = &6.
      WA_FIELDCAT-SELTEXT_M = &6.
      WA_FIELDCAT-SELTEXT_S = &6.
    ENDIF.
    WA_FIELDCAT-DO_SUM = &7.
    WA_FIELDCAT-OUTPUTLEN = &8.
    APPEND WA_FIELDCAT TO TB_FCAT.
  END-OF-DEFINITION.
  FIELD_CAT  'BUKRS'  'ANLA'     'X' '' 'BUKRS' 'Company Code' '' ''.
  FIELD_CAT  'ANLN1'  'ANLA'     'X' '' 'ANLN1' 'Asset Number' '' ''.
  FIELD_CAT  'ANLN2'  'ANLA'     'X' '' 'ANLN2' 'Asset Sub Number' '' ''.
FIELD_CAT  'ATEXT'   'T5EAE'     'X' '' 'ATEXT' 'Result' '' ''.
  FIELD_CAT  'RESULT'  ''     'X' '' 'RESULT' 'RESULT' '' ''.
ENDFORM.                    " alv_define_field_cat

Answer 1

Hi,
Check this code..
FORM display_report_alv.
  DATA: lt_field_cat TYPE slis_t_fieldcat_alv,
  lt_events TYPE slis_t_event,
  lv_repid LIKE sy-repid.
  PERFORM alv_define_field_cat USING lt_field_cat.
  PERFORM alv_header_build USING t_list_top_of_page[].
  PERFORM alv_eventtab_build USING lt_events[].
  lv_repid = sy-repid.
  IF sy-batch EQ 'X'.  ----> " System Field for Backgroud..if Background use list display
    CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
      EXPORTING
        i_callback_program = lv_repid
        it_fieldcat        = lt_field_cat
        i_save             = 'A'
        it_events          = lt_events[]
      TABLES
        t_outtab           = t_output
      EXCEPTIONS
        program_error      = 1
        OTHERS             = 2.
  ELSE.
    CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
      EXPORTING
        i_callback_program = lv_repid
        it_fieldcat        = lt_field_cat
        i_save             = 'A'
        it_events          = lt_events[]
      TABLES
        t_outtab           = t_output
      EXCEPTIONS
        program_error      = 1
        OTHERS             = 2.
  ENDIF.
  IF sy-subrc NE 0.
    WRITE: / 'Return Code : ', sy-subrc,
    'from FUNCTION REUSE_ALV_GRID_DISPLAY'.
  ENDIF.
ENDFORM.                    "display_report_ALV