Strange View in the database

There is this strange view in the database i am working on: "create or replace view inv_dtls as
select to_char(null) supplier_name,to_date(null) invoice_date, to_number(null) invoice_number from dual where 1=2"  Can any body please tell why exactly such views are needed .Front end of the application is designed using forms 6i.

Regards,
Anish Received on Tue Aug 02 2005 - 04:27:44 CDT