Null values not returned

Friends it is strange that when I run a query like
SELECT * FROM EMPLOYEE_TABLE WHERE EMP_DEPT_CODE != '01'
doesnt return me records with EMP_DEPT_CODE = null ...which I thought is not = '01' !!
Please tell me why is this happening.I am looking for materials and they are not at all helpful.
Thanks
MS

NULL is not equivalent to != '01' because a NULL is unknown
Here's an exercise
SQL> select * from test_1;
FLD1
01
02
03
4 rows selected.
SQL> select * from test_1 where fld1 !='01';
FLD1
02
03
2 rows selected.
SQL> select * from test_1 where nvl(fld1,'99') != '01';
FLD1
02
03
3 rows selected.
SQL>

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    The party Id exists and also de party role code and there is at least one project that has that party with that role. I'm sure because I use other web service to find a project by id and in the result the project has the <Party> section with those values.
    I was looking for solutions, notes, threads in forums with no success, then i decided to debug the webservice and I did find the following line in the webservice code.
      SELECT objnr INTO TABLE it_data FROM ihpa
      WHERE  parvw = role_code AND
             parnr = party_id AND
             obtyp = 'PDN'.
    when that line executes the select always returns 0 values, then I look in the table IHPA using the SE16 without any filter and I found that my records exists!! but the select does not get it. I was wondering why the select is not working and then I filter the data in the SE16 using the same values that the query does
    for example:
    PARVW= ZA
    PARNR = 20000143
    OBTYP = PDN
    And I was surprised when the SE16 did not found any value even I was seeing in the previous screen with no filters!!!! And I supouse thats why the webservice is not working. I started making filters one by one, for example firts filtering just de PARVW = ZA and works, but when I filter just the PARNR =  20000143 the SE16 can't find any value, just when I put an * at the end of the number the SE16 returns all the values expected, Im guessing that the fields in the database has blanks at the end but this is a standar table and a standar program.
    Have any of you had the same problem? is there anything that I can do? does anyone knows if this is an unkown bug? becaus I could'n find any note on the marketplace.
    Any help would be appreciated.
    Gustavo Balboa

    Hi!
      The problem were solved but not using the Badi, because the badi only let you change the value of the var party_id and that var is declared as PARNR (of type numeric with length 10), and no mater wat you do the two 00 can´t be removed.
      We solved the problem with an enhancement point in the code at the method "party_get_data", look at the beginin and at the end. We just change the type of var used for party_id.. now we use a CHAR one insted the numeric used by the original code.
    And we repeat the select...
    Thank you very much for the help.
    METHOD party_get_data.
    """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""$"$SE:(1) Class CL_PRS_PROJECTPRJPARTYQR, Method PARTY_GET_DATA, Start                                                                                A
    $$-Start: (1)----
    $$
    ENHANCEMENT 1  ZPARTY_GET_DATA.    "active version
    DATA : WA_PARNR TYPE I_PARNR.
    DATA : WA_CHPAR(10) TYPE C.
    ENDENHANCEMENT.
    $$-End:   (1)----
    $$
      DATA :  temp_object_number TYPE ihpa-objnr,
              field1 TYPE char50,
              field2 TYPE char50,
              field_role TYPE char50,
              field_party TYPE char50,
              st_object_number TYPE TABLE OF bapiprexp.
      DATA : it_data TYPE TABLE OF st_data,
             wa_data LIKE LINE OF it_data,
             itab TYPE TABLE OF st_data,
             wa LIKE LINE OF itab,
             wa_project_details LIKE LINE OF project_details,
             null.
    Select Object number based on input Party and Role
      SELECT objnr INTO TABLE it_data FROM ihpa
      WHERE  parvw = role_code AND
             parnr = party_id AND
             obtyp = 'PDN'.
    Select Project ID based on input Object number
      LOOP AT it_data INTO wa_data.
        SELECT pspid post1 FROM proj INTO CORRESPONDING FIELDS OF wa_data
        WHERE  objnr = wa_data-pspid.                         "#EC CI_NOFIELD
        ENDSELECT.
        MOVE-CORRESPONDING wa_data TO wa.
        APPEND wa TO itab.
      ENDLOOP.
      IF sy-subrc <> 0.
        field_role = cl_wd_utilities=>get_otr_text_by_alias( 'PLM-SE_PRS_XI_PROXY/ROLE_CODE' ) .
        field_party = cl_wd_utilities=>get_otr_text_by_alias( 'PLM-SE_PRS_XI_PROXY/PARTY_ID' ) .
        CONCATENATE  field_role role_code_external INTO field1.
        CONCATENATE  field_party party_id INTO field2.
        MESSAGE e002(ecc_se_common) WITH field1 field2 INTO null.
        CALL FUNCTION 'PS_BAPI_MESSAGE_APPEND'
          TABLES
            return = party_return.
      ELSE.
        MESSAGE s082(ops_se_prs) INTO null.
        CALL FUNCTION 'PS_BAPI_MESSAGE_APPEND'
          TABLES
            return = party_return.
      ENDIF.
      LOOP AT itab INTO wa.
        MOVE-CORRESPONDING wa TO wa_project_details.
        APPEND wa_project_details TO project_details.
      ENDLOOP.
    """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""$"$SE:(2) Class CL_PRS_PROJECTPRJPARTYQR, Method PARTY_GET_DATA, End                                                                                A
    $$-Start: (2)----
    $$
    ENHANCEMENT 2  ZPARTY_GET_DATA.    "active version
      WA_CHPAR = party_id.
      SHIFT WA_CHPAR BY 2 PLACES.
      CLEAR party_return.
      REFRESH party_return.
      SELECT objnr INTO TABLE it_data FROM ihpa
      WHERE  parvw = role_code AND
             parnr = WA_CHPAR AND
             obtyp = 'PDN'.
    Select Project ID based on input Object number
      LOOP AT it_data INTO wa_data.
        SELECT pspid post1 FROM proj INTO CORRESPONDING FIELDS OF wa_data
        WHERE  objnr = wa_data-pspid.                         "#EC CI_NOFIELD
        ENDSELECT.
        MOVE-CORRESPONDING wa_data TO wa.
        APPEND wa TO itab.
      ENDLOOP.
      IF sy-subrc <> 0.
        field_role = cl_wd_utilities=>get_otr_text_by_alias( 'PLM-SE_PRS_XI_PROXY/ROLE_CODE' ) .
        field_party = cl_wd_utilities=>get_otr_text_by_alias( 'PLM-SE_PRS_XI_PROXY/PARTY_ID' ) .
        CONCATENATE  field_role role_code_external INTO field1.
        CONCATENATE  field_party party_id INTO field2.
        MESSAGE e002(ecc_se_common) WITH field1 field2 INTO null.
        CALL FUNCTION 'PS_BAPI_MESSAGE_APPEND'
          TABLES
            return = party_return.
      ELSE.
        MESSAGE s082(ops_se_prs) INTO null.
        CALL FUNCTION 'PS_BAPI_MESSAGE_APPEND'
          TABLES
            return = party_return.
      ENDIF.
      LOOP AT itab INTO wa.
        MOVE-CORRESPONDING wa TO wa_project_details.
        APPEND wa_project_details TO project_details.
      ENDLOOP.
    ENDENHANCEMENT.
    $$-End:   (2)----
    $$
    ENDMETHOD.

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