Having problems copying Source file to a library where the source already exists

Our process, when we make changes to any source file, is to copy the
original source file to OLDSRC.  In OLDSRC there may be older copies of
this same source.  I still want to copy into this library and just have
it override the one that is already there.

In a 5250 screen, this isn't a problem as I am simply asked that one
already exists, do I want to override and I say Yes.

When I choose Copy To.. in the Table View using the scenario above, it
does not give me an option to override the original.  Instead, a message
comes up saying that a source already exists with that name and I need
to give it a new name if I want to copy.

We do this all the time so I need to be able to override files with
same names.

Is there a setting I need to change to allow this?

Kim Stewart