while creating a DML ( Automatic Row Processing ) , can not set value of radio button .Confirmed as appearing in ARP (DML) processes in APEX 4.2.1.00.08. This does indeed appear to be a bug. However it is only cosmetic. DML Fetch Mode is an ARF (fetch) process option that is deprecated in APEX 4.x. Setting it for ARP (DML) processes is unnecessary, so you can safely ignore it.
is this a bug , or i am missing something?