Update for Derive Tables - response (3) by nevermore

Hi,
When I used the upper query for update, I get the error "Derived table not allowed to update".
So I stop using derived table and convert my query as shown below :
 
 

UPDATE T1
FROM
TABLE_1 T1 , 
TABLE_2 T2 ,
TABLE_3 T3 ,
(
SELECT
COL1, COL2, COL3, COL4 
FROM TABLE_4 T4
INNER JOIN TABLE_5 T5 ON T4.ID = T5.ID
INNER JOIN TABLE_6 T6 ON T5.ID = T6.ID
) LRY
SET  COL55 = 33  -- T1 table's column
WHERE  LRY.COL1 = TGT.COL1 AND
T1.ID = T2.ID AND 
T2.ID = T3.ID

 
Thank you all.