I can't believe this is a bug

IDS 9.21.UC4 on Solaris 2.6 Look at this code:- select pnr_locator from ftravel_tr4@ifmx_flx:pnr_info where pnr_locator not in (select pnr from rpt_table where dep_date > TODAY-331) and pnr_locator not in (select pnr_locator from pnr_status where pnrstat = 'A') ^^^^^^^^^^^ this is a typo. There is no such field pnr_locator in the table pnr_status. The correct column name is pnr. But the query runs fine without returing any rows. It took me hours to find it out. Once I corrected the column name, the query started running fine. The above was tested in dbaccess. Is this a bug. Sounds too lame. This is basic sql parsing which is failing. ravi