ERROR AL UTILIZAR UNION ALL

Compañeros necesito una vez mas de su ayuda . Estoy utilizando el siguiente query, pero cuando lo hago correr me sale el error "Sintaxis incorrecta cerca de la palabra UNION".

Alguien sabes porque pueda ser?? trate de disminuir el código pero aun así me sigue saliendo el error. ademas de utilizar solo la palabra union.

Espero alguien me pueda ayudar y necesita mas informacion, me pregunta nomas.

Un saludo.

SELECT 
T0.[CardCode],
T0.[CardName],
T0.[DocNum],
T0.[DocDate],
T1.[ItemCode],
T1.[Dscription],
'Doc Destino 1' = CASE WHEN T3.OBJTYPE = '18' AND T3.ISINS = 'Y' THEN 'Fact. Reserva Prov.'                                  WHEN T3.OBJTYPE = '18' AND T3.ISINS = 'N' THEN 'Fact. Prov.'
ELSE NULL END


FROM OPOR T0
INNER JOIN POR1 T1 ON T0.DOCENTRY = T1.DOCENTRY
LEFT OUTER JOIN PCH1 T2 ON T2.BASEENTRY = T1.DOCENTRY AND T2.BASETYPE = T1.OBJTYPE AND T2.BASELINE = T1.LINENUM
LEFT OUTER JOIN OPCH T3 ON T2.DOCENTRY = T3.DOCENTRY


LEFT OUTER JOIN PDN1 T4 ON T4.BASEENTRY = T1.DOCENTRY AND T4.BASETYPE = T1.OBJTYPE AND T4.BASELINE = T1.LINENUM 
LEFT OUTER JOIN OPDN T5 ON T4.DOCENTRY = T5.DOCENTRY


WHERE T0.[CardCode] =[%0] 
AND T0.CANCELED = 'N' 


ORDER BY T0.CARDCODE ASC


UNION ALL


SELECT
T0.[CardCode],
T0.[CardName],
T0.[DocNum],
T0.[DocDate],
T1.[ItemCode],
T1.[Dscription],
'Doc Destino 1' = CASE WHEN T3.OBJTYPE = '20' THEN 'Entrada de Merc.'                               
ELSE NULL END


FROM OPOR T0
INNER JOIN POR1 T1 ON T0.DOCENTRY = T1.DOCENTRY
LEFT OUTER JOIN PDN1 T2 ON T2.BASEENTRY = T1.DOCENTRY AND T2.BASETYPE = T1.OBJTYPE AND T2.BASELINE = T1.LINENUM
LEFT OUTER JOIN OPDN T3 ON T3.DOCENTRY = T2.DOCENTRY


LEFT OUTER JOIN PCH1 T4 ON T4.BASEENTRY = T2.DOCENTRY AND T4.BASETYPE = T2.OBJTYPE AND T4.BASELINE = T2.LINENUM
LEFT OUTER JOIN OPCH T5 ON T5.DOCENTRY = T4.DOCENTRY


WHERE T0.[CardCode] =[%0] 
AND T0.CANCELED = 'N' 


ORDER BY T0.CARDCODE ASC