Unique constraint or index, case insensitive, on multiple fields

I am on version 7.3. I have been able to build a case insensitive index to
keep the refullname column unique with the following:

CREATE UNIQUE INDEX resource_refullname
ON resource USING btree (upper(refullname) text_ops);

However I have a table where I want to allow a duplicate refullname if
the redtid field (int4) is different. When I try building an index using
the command below I get an error. I still need the refullname to be case
insensitive.

CREATE UNIQUE INDEX resource_refullname
ON resource USING btree (redtid, (upper(refullname) text_ops));

The index will work with (redtid, refullname) but then the index is not
case insensitive on refullname.

Thanks,
Margaret Gillon, IS Dept., Chromalloy Los Angeles, ext. 297