ошибка при выполнении запроса вида ..

-- поля таблицы Kzn --

"Insp" VARCHAR(4)
CHARACTER SET WIN1251 DEFAULT '' COLLATE PXW_CYRL
"Acc_num" VARCHAR(7)
CHARACTER SET WIN1251 DEFAULT '' COLLATE PXW_CYRL
"Dat" DATE
"D" DECIMAL(18,2)
"C" DECIMAL(18,2)
"IDpck" INTEGER
"IDkzn" INTEGER
 
-- пример запроса --
 
SELECT "Insp", "Acc_num", "Dat", "D", "C", "IDpck", "IDkzn" ');
 FROM "Kzn"
WHERE
 "Insp" in ('0001','0002') and  
 "Acc_num" in ('1010510','1400310','030120') and  
 "Dat" between '12-MAR-2003' and '23-APR-2003'
 
UNION  
 
SELECT "Insp", "Acc_num", max("Dat") dat, sum("D") D, sum("C") C, 0 IDpck, 0 IDkzn  
 FROM "Kzn"
WHERE
 "Insp" in ('0001','0002') and  
 "Acc_num" in ('1010510','1400310','030120') and  
 "Dat" between '12-MAR-2003' and '23-APR-2003'
GROUP BY "Insp", "Acc_num"  
 
order by "Insp","Acc_num" // на этой строке ошибка след (invalid ORDER BY clause)
 
 
заранее благодарен за Ваше внимание :о)