Report based on 3 tables

Question

I am new to ABAP development
I have 3 table, A905, A919 and KONP. Knumh field - condition record is common in both A905 and A919.
common fields in A905 and A919 is VKORG, VTWEG , KSCHL,  KSCHL, REGIO . From A919 AUART_sd to be be displayed in the report with VKORG,VTWEG,KSCHL,REGIO, from A905 and knumh referrence from a905 and a919 to KONp-KNUMH.
Following are the codes :But when executed the below codes data from A919 which has different condition reocrd is not getting displayed. But auart_sd is filled in the data that is executed from A905. Please help to make correction in the following  program.
tables : A905,A919,KONP.
TYPE-POOLS : slis.
TYPES : begin of ty_A905,
  ALAND TYPE A905-ALAND,
  TaXK1 TYPE A905-TAXK1,
  TaxM1 TYPE A905-TAXM1,
  VKORG TYPE A905-VKORG,
  VTWEG TYPE A905-VTWEG,
  KONDM TYPE A905-KONDM,
  DATAB TYPE A905-DATAB,
  DATBI TYPE A905-DATBI,
  KAPPL TYPE A905-KAPPL,
  KSCHL TYPE A905-KSCHL,
  MWSK1 Type konp-MWSK1,
  ALAND1 TYPE A919-ALAND,
  TaXK2 TYPE A919-TAXK1,
  TaxM2 TYPE A919-TAXM1,
  VKORG1 TYPE A919-VKORG,
  VTWEG1 TYPE A919-VTWEG,
  KONDM1 TYPE A919-KONDM,
  DATAB1 TYPE A919-DATAB,
  DATBI1 TYPE A919-DATBI,
  KAPPL1 TYPE A919-KAPPL,
  KSCHL1 TYPE A919-KSCHL,
  MWSK2 Type konp-MWSK1,
  knumh TYPE A919-knumh,
  AUART_sd TYPE A919-auart_sd,
  wkreg1 TYPE a919-wkreg,
  regio1 TYPE a919-regio,
  image TYPE c,
  END OF ty_a905.
  DATA : it_display TYPE TABLE OF ty_A905 WITH HEADER LINE.
  DATA : it_display1 TYPE TABLE OF ty_A905 WITH HEADER LINE.
  DATA : it_fieldcat TYPE slis_t_fieldcat_alv,
         wa_fieldcat TYPE slis_fieldcat_alv.
  DATA :   w_ssfctrlop TYPE ssfctrlop,
           w_func TYPE rs38l_fnam ,
           w_doinfo TYPE ssfcrespd ,
           w_opinfo TYPE ssfcrescl ,
           w_joopt  TYPE ssfcresop .
DATA : w_no_of_lines TYPE int4.
SELECT-OPTIONS :
                  so_KAPPL FOR A905-KAPPL,
                  so_kschl FOR A905-kschl,
                  so_VKORG FOR A905-VKORG,
                  so_VTWEG FOR A905-VTWEG,
                  so_kondm FOR A905-kondm,
                  so_wkreg FOR A919-wkreg.
START-OF-SELECTION.
SELECT   A905~VKORG
         A905~KAPPL
         A905~kschl
         A905~VTWEG
         A905~KONDM
         A905~DATAB
         A905~DATBI
         A905~ALAND
         A905~TaxK1
         A905~TaxM1
         A905~KNUMH
         A919~AUART_SD
         A919~VKORG
         a919~VTWEG
         KONP~MWSK1
         KONP~KNUMH
    INTO CORRESPONDING FIELDS OF TABLE it_display from a905
    INNER JOIN a919 on a905~kschl = a919~kschl
    INNER JOIN konp on a905~knumh = konp~knumh
     where a905~kappl in so_kappl
     and a905~kschl in so_kschl
     and a905~VKORG in so_vkorg
     and a905~vtweg in so_vtweg
     and a905~kondm in so_kondm
     and a905~wkreg in so_wkreg.

Answer 1

are you sure your data meets the JOIN conditions?
You can make a quick check.. only example...
select single * from KONP into ls_konp
where knumh = P_knumh.
if sy-subrc eq 0.
select * from from A905 into table lt_a905 where
     kappl in so_kappl
     and kschl in so_kschl
     and VKORG in so_vkorg
     and vtweg in so_vtweg
     and kondm in so_kondm
     and wkreg in so_wkreg
     and knumh = ls_konp-knumh.
if sy-subrc eq 0.
select * from A919 into table lt_a919
for all entries in lt_a905
where kappl = lt_a905-kappl
and kschl = lt_905-kschl
and knumh = lt_905-knumh.
endif.
endif.