Server Utilities :: Token Longer Than Max Allowable Length Of 258 Chars

i tried to apply a sql case statement in sql loader control file in " " the load succeed with 258 chars case or decode statement but when i add more cases it return sql loader 350 token longer than max

LOAD DATA
INFILE 'F:Vouvou20110613_102_951454.unl'
BADFILE 'F:Vouvou.pad'
DISCARDFILE 'F:Vouvou.dic'
replace
INTO TABLE vou_test_2
FIELDS TERMINATED BY '|'
TRAILING NULLCOLS
[code].......

the above one succeed when i edit the case statement as follow

ACCOUNT_2001 "CASE WHEN:ACCOUNTTYPE1='2001'THEN :REWARDAMOUNT1 WHEN :ACCOUNTTYPE2='2001' THEN :REWARDAMOUNT2
WHEN :ACCOUNTTYPE3='2001' THEN :REWARDAMOUNT3
WHEN :ACCOUNTTYPE4='2001' THEN :REWARDAMOUNT4
WHEN :ACCOUNTTYPE5='2001' THEN :REWARDAMOUNT5
WHEN :ACCOUNTTYPE6='2001' THEN :REWARDAMOUNT6
WHEN :ACCOUNTTYPE7='2001' THEN :REWARDAMOUNT7
WHEN :ACCOUNTTYPE8='2001' THEN :REWARDAMOUNT8
WHEN :ACCOUNTTYPE9='2001' THEN :REWARDAMOUNT9
WHEN :ACCOUNTTYPE10='2001' THEN :REWARDAMOUNT10 END"

i got the Error sql loader 350 token longer than max allowable length of 258 chars .

note : i cant modify the table structure to shorten the column names .