After enabling the ACS Developer Support each request for a page
results in a server error. The culprit is ds_user_select_widget which
is called by rp_handler. ds_user_select_widget tries to execute the
following query:
        select u.user_id as user_id_from_db,
               acs_object.name(user_id) as name,
               p.email
        from   users u,
               parties p
        where  u.user_id = p.party_id
This query causes an dbinit error :
        parser: parse error at or near "("
It is here that my limited knowledge of Postgresql leaves me
hanging. Could someone shed some light on the matter?