Getting error Column ambiguosly defined even though column is referenced

select dh_events.case_id
     FROM ah_events_to_drgs FULL OUTER JOIN dh_events
ON ah_events_to_drgs.case_id=dh_events.case_id
     and ah_events_to_drgs.case_id='2007SP000006'
getting error Column ambiguosly defined even though column is referenced, Please let me know why it is giving error.
Thanks
Murthy

Could you demonstrate this in details ?
SQL> create table ah_events_to_drgs (case_id varchar2(20));
Table created.
SQL> create table dh_events (case_id varchar2(20));
Table created.
SQL> select dh_events.case_id
  2  FROM ah_events_to_drgs FULL OUTER JOIN dh_events
  3  ON ah_events_to_drgs.case_id=dh_events.case_id
  4  and ah_events_to_drgs.case_id='2007SP000006'
  5  /
no rows selected
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - ProductionRgds

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