Problems using a rule with the WHERE clause

Hello <p>I'm using a rule without a WHERE clause that's working fine. Now a have to put a where clause because I only
wantthe rule be get executed only in some occasions, but I'm having some problems with that. <p>This rule is over a
viewcalled docentesturno. <p>The code that I was using in the rule when I didn't had the WHERE clause was: <p><b>CREATE
RULE"updateturnodocente" AS ON UPDATE TO "docentesturno"</b><br /><b> DO INSTEAD (</b><br /><b> UPDATE
"pessoalEvento"</b><br/><b>  SET "idPessoal" = NEW."idpessoal",</b><br /><b>   ponderacao = NEW.ponderacao,</b><br
/><b>  envolvimento = NEW.envolvimento</b><br /><b>  WHERE id_pe = OLD.id_pe;</b><br /><b> );</b><br />  <p>Now the
codefor the rule with WHERE: <p><b>CREATE RULE "updateturnodocente" AS ON UPDATE TO "docentesturno"</b><br /><b> WHERE
OLD.idpessoal!= 0</b><br /><b> DO INSTEAD (</b><br /><b> UPDATE "pessoalEvento"</b><br /><b>  SET "idPessoal" =
NEW."idpessoal",</b><br/><b>   ponderacao = NEW.ponderacao,</b><br /><b>   envolvimento = NEW.envolvimento</b><br
/><b> WHERE id_pe = OLD.id_pe;</b><br /><b> );</b><b></b><p>When I execute the INSERT into de view docentesturno I got
themessage: <br />            ERROR:  Cannot update a view without an appropriate rule <br />  <p>Do someone knows what
canbe the problem in this rule? <br />Apparently I'm doing in the same way of the manual, chapter 13.7.2 !!!!!!! <br
/> <br />  <p>Best regards <p>Luis Sousa