Please help

Hi,

I am getting an error from this query and I do not no why. The error is:

"[IBM][System i Access ODBC Driver][DB2 for i5/OS]SQL0901 - SQL system error".

Each query alone is working but when I try to join I get this error. Here is the code:

WITH
MASTER
AS
(
SELECT

IDISC, TCAT, IDSCO,
SUM(TVLS) AS SALES_UAH,
SUM(TTRNQ) AS SALES_QTY

FROM GALF6HK.IT
LEFT JOIN GALF6HK.II ON TCAT = ICAT

WHERE (TTYPE In ('BD','BC'))
AND (TSAL='Y')
AND (TYPE Not In ('T'))
AND (TTRN Between 20120101 And 20121231)

GROUP BY IDISC, TCAT, IDSCO
),

PL
AS
(
SELECT
DDCAT,

MAX(CASE WHEN DDPRN = 1 THEN DDVUL ELSE 0 END) AS PL1,
MAX(CASE WHEN DDPRN = 2 THEN DDVUL ELSE 0 END) AS PL2


FROM GALF6HK.DD

GROUP BY DDCAT

HAVING MAX(CASE WHEN DDPRN = 1 THEN DDVUL ELSE 0 END)>0
OR MAX(CASE WHEN DDPRN = 2 THEN DDVUL ELSE 0 END)>0

)

SELECT
IDISC, TCAT, IDSCO,
SALES_UAH,
SALES_QTY

FROM MASTER
LEFT JOIN PL ON DDCAT = TCAT