Spatial topology - Error adding layer

Question

Hi all,
I am new to Oracle Spatial and I am evaluating Spatial Topology.
Can anyone tell-me why I can’t add this layer to my topology?
BEGIN
SDO_TOPO.ADD_TOPO_GEOMETRY_LAYER('T1', 'F2','FEATURE', 'POINT');
END;
ORA-13111: cannot add topo_geometry layer [IVITOH.F2.FEATURE] to topology
ORA-06512: at "MDSYS.MD", line 1723
ORA-06512: at "MDSYS.MDERR", line 17
ORA-06512: at "MDSYS.SDO_TOPO", line 293
ORA-06512: at line 2
select astm.TOPOLOGY, astm.TG_LAYER_ID, astm.TABLE_NAME from ALL_SDO_TOPO_METADA
TOPOLOGY TG_LAYER_ID TABLE_NAME
T1 1 F1
1 row selected
Thanks in advance,
Vitor Herdeiro
Infrastructure:
OS:AIX 5L 64
SQL> conn sys@sigd as sysdba
Enter password: *******
Connected.
SQL> BEGIN
2 MDSYS.validate_sdo;
3 END;
4 /
PL/SQL procedure successfully completed.
SQL> select comp_id, control, schema, version, status, comp_name from dba_registry
2 where comp_id='SDO';
COMP_ID CONTROL
SCHEMA VERSION STATUS
COMP_NAME
SDO SYS
MDSYS 10.1.0.2.0 VALID
Spatial
SQL> select object_name, object_type, status from dba_objects
2 where owner='MDSYS' and status <> 'VALID'
3 order by object_name;
no rows selected
SQL>

Answer 1

Daniel,
I have already found my mistake.
I was trying to add the topo_geometry layer [IVITOH.F2.FEATURE] when the table F2 was not created yet .
Tanks a lot anyway,
Best regards,
Vitor