Problème de référence à un alias de table

Bonjour à tous, je souhaiterais exécuter la requête suivante:

Code:

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SELECT
        reg.lib_caisse                         LIB_CAISSE,
        bul.idf_agent                          MATRICULE,
        his.nom_usuel || ' ' || his.nom_prenom NOM_PRENOM,
        bul.cod_rub                            COD_RUBRIQUE,
        bul.bas_rub                            BAS_RUB,
        bul.tau_rub                            TAU_RUB,
        bul.mnt_rub                            MNT_RUB
FROM rh.bulpai bul,
     og.ident_his his ,
     rh.agtnat nat,
     rh.agtpai pai,
     rh.inriaregcot reg,
     rh.vue_charges vue
WHERE pai.idf_agent = nat.idf_agent
and nat.idf_agent = 21413
and pai.idf_cle = nat.idf_cle
and pai.cod_coll = nat.cod_coll
--and pai.cod_regcot = reg.cod_regime
and reg.cod_regime = (
                      select cod_regcot from ( select distinct cod_regcot,dat_calpai from agtpai_h where idf_agent=pai.idf_agent
                        and cod_regcot <> 0 and num_emploi = 1
                        union select distinct cod_regcot,dat_calpai from agtpai where idf_agent= pai.idf_agent 
                        and cod_regcot <> 0  and num_emploi=1
                        order by dat_calpai desc )
                      where rownum=1
                      )
and nat.ident_id    = his.ident_id
AND  bul.idf_agent  = nat.idf_agent
AND  bul.idf_cle  = nat.idf_cle
AND  bul.cod_coll  = nat.cod_coll
and pai.num_emploi =1
and pai.num_periode = 1
and bul.mnt_rub <>0
AND bul.cod_coll ='test'
AND pai.cod_coll ='test'
AND nat.cod_coll ='test'
and bul.cod_rub = vue.cod_rub
and vue.typ_cotis ='ASS'
AND   to_date(to_char(his.dat_debut,'DD/MM/YYYY'),'DD/MM/YYYY') <= to_date(to_char(sysdate,'DD/MM/YYYY'),'DD/MM/YYYY')
AND   to_date(to_char(his.dat_fin,'DD/MM/YYYY'),'DD/MM/YYYY')   > to_date(to_char(sysdate,'DD/MM/YYYY'),'DD/MM/YYYY')
ORDER BY LIB_CAISSE,MATRICULE;

mais le système me renvoie:

Code:

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Error at line 22
ORA-00904: "PAI"."IDF_AGENT" : identificateur non valide

Est-ce que celà vient tdu nombre d'imbrication de sous requête?