Hi Raúl;
1) OK - your DBMS setting of "ORA" means that you are trying to use the OCI (Oracle Client Interface) which is a native DB connection.
2) Can you try adding the following to SQLCA.DBParm ....
DbParm=DisableBind=0
3) If #2 does not correct the issue ... can you change the following:
SQLCA.DBMS = "TRA ORA"
=> This will give us an SQL trace to the point of failure.
Regards ... Chris