problem with set_sequence_name please help

I'm building rails 3 with legacy oracle 10g db. which it's sequence is
non rails convension.

I have try this.

class AdCourt < ActiveRecord::Base
  set_sequence_name 'COURT_SEQ'
end

with rails console :

AdCourt.sequence_name I have got "COURT_SEQ" which look ok.

When

AdCourt.create!(:caption => 'AAAA', :code => '1111', :version => 0,
:created_by_id => 0)

it's still using "ad_courts_seq" which not exist.

ActiveRecord::StatementInvalid: ActiveRecord::ActiveRecordError:
ORA-02289: sequence does not exist
: select ad_courts_seq.nextval id from dual
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:202:in
`log'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-jdbc-adapter-0.9.7-java/lib/active_record/connection_adapters/jdbc_adapter.rb:582:in
`execute'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-jdbc-adapter-0.9.7-java/lib/jdbc_adapter/jdbc_oracle.rb:390:in
`select'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-jdbc-adapter-0.9.7-java/lib/active_record/connection_adapters/jdbc_adapter.rb:578:in
`select_one'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-jdbc-adapter-0.9.7-java/lib/jdbc_adapter/jdbc_oracle.rb:163:in
`insert'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/arel-1.0.1/lib/arel/engines/sql/engine.rb:30:in
`create'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/arel-1.0.1/lib/arel/algebra/relations/writes.rb:24:in
`call'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/arel-1.0.1/lib/arel/session.rb:17:in
`create'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/arel-1.0.1/lib/arel/algebra/relations/relation.rb:159:in
`insert'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/relation.rb:14:in
`insert'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/persistence.rb:271:in
`create'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/timestamp.rb:47:in
`create'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/callbacks.rb:281:in
`create'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activesupport-3.0.0/lib/active_support/callbacks.rb:428:in
`_run_create_callbacks'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/callbacks.rb:281:in
`create'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/persistence.rb:247:in
`create_or_update'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/callbacks.rb:277:in
`create_or_update'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activesupport-3.0.0/lib/active_support/callbacks.rb:428:in
`_run_save_callbacks'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/callbacks.rb:277:in
`create_or_update'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/persistence.rb:56:in
`save!'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/validations.rb:49:in
`save!'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/attribute_methods/dirty.rb:30:in
`save!'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/transactions.rb:242:in
`save!'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/transactions.rb:289:in
`with_transaction_returning_status'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in
`transaction'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/transactions.rb:204:in
`transaction'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/transactions.rb:287:in
`with_transaction_returning_status'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/transactions.rb:242:in
`save!'
  from
/Users/cyberjom/.rvm/gems/jruby-1.5.2/gems/activerecord-3.0.0/lib/active_record/validations.rb:34:in
`create!'