whole-row functional index?

jasen=# update member set id=id where id=441;
UPDATE 1
jasen=# create index member_search on member using gin (
(get_search_text_internal(member)) );
CREATE INDEX
jasen=# update member set id=id where id=441;
ERROR:  table row type and query-specified row type do not match
DETAIL:  Physical storage mismatch on dropped attribute at ordinal
position 109.
jasen=# select version();
-[ RECORD 1 ]-----------------------------------------------------------------------------------------
version | PostgreSQL 8.3.7 on i486-pc-linux-gnu, compiled by GCC gcc-4.3.real (Debian 4.3.2-1.1) 4.3.2

the function get_text_search_internal returns type tsvector