validate my script logic: reference erro LOOKUP is not defined

Dear all,

i want write one script logic. It use LOOKUP using FOR/NEXT.

But when i check stament in my script logic: messesage erro: reference erro LOOKUP is not defined.Can you help me?

My script logic

*XDIM_MEMBERSET ACCOUNT=BS221

*XDIM_ADDMEMBERSET CATEGORY = Actual

*XDIM_ADDMEMBERSET ENTITY = CSO

*SELECT(%TIME%,"[ID]",TIME,"[ID]>=2006.01 AND [ID]<=2006.02")

*XDIM_MEMBERSET TIME = %TIME%

*LOOKUP Rates

*DIM  CATEGORY ="Actual"

*DIM R_ACCOUNT ="AVG"

*DIM R_ENTITY ="Global"

*DIM INPUTCURRENCY="USD"

*DIM MEASURES ="PERIODIC"

*FOR %T% = %TIME%

*DIM RATE_%T%: TIME =%T%  

*NEXT

*ENDLOOKUP

*WHEN ACCOUNT

*IS "BS221"

*FOR %T1% = %TIME%

*REC(EXPRESSION=LOOKUP(RATE_%T1%),TIME=%T%)

*NEXT

*ENDWHEN

*COMMIT

Thanks,

Hungth