How do you create a sequence number in SQL Developer Data Modeler?

I am new to Data Modeler and am looking to create a sequence number but do not know how to do the same using the Data Modeler. Can someone guide me? Thanks.
Edited by: user6710206 on Jun 9, 2010 7:32 AM

I have had found that the following works sometimes when coming immediately after the create or replace package body in a script (although it isn't doing anything for me on invalid package bodies at the moment):
show errors package body <package name>
Because it is inconsistent, you cannot really trust it, which gets you back to Jim's options (open in editor or compile from connection tree) or the old long hand of
select * from user_errors where type = 'PACKAGE BODY' and name = '<package name>'

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