FirebirdSQL to PostgreSQL

Hello,

I have below sql running fine on FirebirdSQL but not on PostgreSQL. As I am
not the editor of the SQL, I cannot fix it to work with PostgreSQL. Any help
is appreciated.

Not posting table details not to bloat the message.

I do not have Access to database right now. Error Message I receive is
something like:
Field "kaynak" not found on right table

SELECT
RAPOR_EK.KAYNAK,
RAPOR_EK.SEBEP,
COALESCE(DT.IAIK_OG, 0) AS "IAIK_OG",
COALESCE(DT.IAIK_AG, 0) AS "IAIK_AG",
COALESCE(DT.IAIK_TOPLAM, 0) AS "IAIK_TOPLAM",
COALESCE(DT.IADK_OG, 0) AS "IADK_OG",
COALESCE(DT.IADK_AG, 0) AS "IADK_AG",
COALESCE(DT.IADK_TOPLAM, 0) AS "IADK_TOPLAM",
COALESCE(DT.GNLTOPLAM, 0) AS "GNLTOPLAM"
FROM RAPOR_EK
LEFT JOIN (
SELECT
M.TKS_KAYNAGAGORE AS "KAYNAK",
M.TKS_SEBEBEGORE AS "SEBEP",
(sum(M.TES_IMARALANICIOG)/(select sum(I.ILC_IMARALANICI_OG) from
ILCELER_TABLOSU I where I.ILCEADI = 'CİHANBEYLİ')*60) as "IAIK_OG",
(sum(M.TES_IMARALANICIAG)/(select sum(I.ILC_IMARALANICI_AG) from
ILCELER_TABLOSU I where I.ILCEADI = 'CİHANBEYLİ')*60) as "IAIK_AG",
((sum(M.TES_IMARALANICIOG) + sum(M.TES_IMARALANICIAG)) / ((select
sum(I.ILC_IMARALANICI_OG) from ILCELER_TABLOSU I where I.ILCEADI =
'CİHANBEYLİ') + (select sum(I.ILC_IMARALANICI_AG) from ILCELER_TABLOSU I
where I.ILCEADI = 'CİHANBEYLİ'))*60) AS "IAIK_TOPLAM",
(sum(M.TES_IMARALANDISIOG)/(select sum(I.ILC_IMARALANDISI_OG) from
ILCELER_TABLOSU I where I.ILCEADI = 'CİHANBEYLİ')*60) as "IADK_OG",
(sum(M.TES_IMARALANDISIAG)/(select sum(I.ILC_IMARALANDISI_AG) from
ILCELER_TABLOSU I where I.ILCEADI = 'CİHANBEYLİ')*60) as "IADK_AG",
((sum(M.TES_IMARALANDISIOG) + sum(M.TES_IMARALANDISIAG)) / ((select
sum(I.ILC_IMARALANDISI_OG) from ILCELER_TABLOSU I where I.ILCEADI =
'CİHANBEYLİ') + (select sum(I.ILC_IMARALANDISI_AG) from ILCELER_TABLOSU I
where I.ILCEADI = 'CİHANBEYLİ'))*60) AS "IADK_TOPLAM",
((sum(M.TES_IMARALANICIOG) + sum(M.TES_IMARALANICIAG) +
(sum(M.TES_IMARALANDISIOG) + sum(M.TES_IMARALANDISIAG))) / ((select
sum(I.ILC_IMARALANICI_OG) from ILCELER_TABLOSU I where I.ILCEADI =
'CİHANBEYLİ') + (select sum(I.ILC_IMARALANICI_AG) from ILCELER_TABLOSU I
where I.ILCEADI = 'CİHANBEYLİ') + (select sum(I.ILC_IMARALANDISI_OG) from
ILCELER_TABLOSU I where I.ILCEADI = 'CİHANBEYLİ') + (select
sum(I.ILC_IMARALANDISI_AG) from ILCELER_TABLOSU I where I.ILCEADI =
'CİHANBEYLİ'))*60) AS "GNLTOPLAM"
FROM TABLO_MEDAS M
WHERE
M.T_ILCE = 'CİHANBEYLİ'
AND M.T_BILDIRIMEGORE = 'Bildirimsiz'
AND M.TKS_SUREYEGORE = 'Uzun'
AND (M.T_BASLAMATARIHI >= '2015-01-01' AND T_BASLAMATARIHI <=
'2015-01-31 23:59:59')
GROUP BY
M.TKS_KAYNAGAGORE,
M.TKS_SEBEBEGORE
) DT USING (KAYNAK, SEBEP)
ORDER BY KAYNAK, SEBEP