Locking...finding out who's locked what.

G'day,
In SQL*Forms 3.0 I have a from which has implemented locking through enter_query(for_update,no_wait). This works fine, but instead of the standard error message of "Attempting to reserve record for update or delete", I would like to display a message such as "OPS$JBLOGGS has locked 1 or more rows that are in your query". Does anyone out there know how to do this ?
Cheers,

--
  ,-_|\   *********** Rocqueforte Daemaen Alexander O'Leary *********** 
 /     \  B.App.Sci.(Comp),BPFH,Uni. Of Western Sydney,Nepean,Australia
 \_.--_/  E-Mail: roleary_at_st.nepean.uws.edu.au  Work Phone: 047 360 435 
      o            "Boldly going where angels fear to tread."