what's wrong in this procedure?

This error is returned Erro de SQL:

ERROR:  column "Aguardando Pagto" does not exist at character 352  >>>


create or replace function get_historico()   RETURNS SETOF twiste.type_cur__historico AS '
  SELECT o.data_fim, sum(t.num_itens * t.valor) AS total, count(t.*) AS transacoes  FROM ofertas o  JOIN transacao t ON
o.ofertas_id= t.ofertas_id  JOIN municipio m ON o.municipio_id = m.municipio_id WHERE  o.data_fim <= now() AND t.status
IN("AguardandoPagto", "Em análise", "Aprovado", "Completo") GROUP BY o.data_fim; 
'
language 'sql';



>> the column is t.status and not "Aguardando Pagto";
>> what's wrong ?  thanks