Result of query different in version 9i and 10g

Question

We have a query wiht correlated subqueries. If we execute this query in version 8 or version 9 the query returns no rows. (as expected).
Running this query in version 10g return 1 row. Is this a change in the semantics of SQL in version 10 or could it be a bug ?
Below is a sample scenaria :
CREATE TABLE A (
ID1 number,
ID2 number,
CODE VARCHAR2(1)
CREATE TABLE B (
ID2 number,
COLX number
INSERT INTO A values ( 1, 1, 'D' );
INSERT INTO A values ( 1, 2, 'I' );
INSERT INTO B values ( 1, 1 );
INSERT INTO B values ( 2, 2 );
COMMIT;
select *
from A A1
where A1.CODE = 'D'
and exists (select 1
from A A2
     where A2.CODE = 'I'
     and A2.ID1 = A1.ID1
     and not exists (select COLX from B where ID2 = A1.ID2 MINUS select COLX from B where ID2 = A2.ID2)
);

Answer 1

Hi,
>>select COLX from B where ID2 = A1.ID2 MINUS select COLX from B where ID2 = A2.ID2Really strange. Well, this problem maybe in this code above.
TESTE@teste> select *
  2  from A A1
  3  where A1.CODE = 'D'
  4  and exists (select 1
  5  from A A2
  6  where A2.CODE = 'I'
  7  and A2.ID1 = A1.ID1
  8  and not exists (select COLX from B where ID2 = A2.ID2 MINUS select COLX from B where B.ID2 = A1.ID2)
  9  );
no rows selected
TESTE@teste> select * from v$version;
BANNER
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
PL/SQL Release 9.2.0.4.0 - Production
CORE    9.2.0.3.0       Production
TNS for Linux: Version 9.2.0.4.0 - Production
NLSRTL Version 9.2.0.4.0 - Production
TESTE@teste> select *
  2  from A A1
  3  where A1.CODE = 'D'
  4  and exists (select 1
  5  from A A2
  6  where A2.CODE = 'I'
  7  and A2.ID1 = A1.ID1
  8  and not exists (select 1 from dual where 1=2)
  9  );
       ID1        ID2 C
         1          1 D
SGMS@ORACLE10> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Prod
PL/SQL Release 10.1.0.2.0 - Production
CORE    10.1.0.2.0      Production
TNS for Linux: Version 10.1.0.2.0 - Production
NLSRTL Version 10.1.0.2.0 - Production
SGMS@ORACLE10> select *
  2  from A A1
  3  where A1.CODE = 'D'
  4  and exists (select 1
  5  from A A2
  6  where A2.CODE = 'I'
  7  and A2.ID1 = A1.ID1
  8  and not exists (select COLX from B where ID2 = A2.ID2 MINUS select COLX from B where B.ID2 = A1.ID2)
  9  );
       ID1        ID2 C
         1          1 DCheers