[ic] Return multiple fields, unique records on non-primary field?

[interchange-users@icdevgroup.org (Bob Pickle)]

I want to do a search that returns the SKU and at least one additional
field. I want to throw out all records that are not unique on that
additional field, as long as they are not blank.

When I use un=1 in the search to try to accomplish this, it doesn't seem
to work with any field that is not the first field listed under rf=.

Is there an easy way to accomplish this?

Bob