create view with unique FID

We have an Oracle view where no unique FID can be retrieved. Without an unique FID Map will not display the data in a form (industry model).

In our situation we only need a unique ID for the sake of the FID requirement by Map. To generate such a unique ID we chose the following approach:

- the view is wrapped by a select statement which includes rownum:

 create or replace view my_view as select  
 rownum fid, t.* from  
 (   
  ... view definition ...  
  ) t;  

As we need to show the data of the view only occasionally performance is not a major concern here.

Map 2013, SP2