DATACOPY did not work with @MEMBER

Hello everyone,

I am trying to use DATACOPY to copy from the prior year to the current year.

DATACOPY "****"->"OEP_Actual"->Final->@MEMBER(@PREVSIBLING(&CurrYr))->"Total Cost Center" TO "OFS_Calculated"->OEP_Forecast->{Version}->&CurrYr->"No Cost Center" ;

My rule is using @MEMBER(@PREVSIBLING(&CurrYr)), it showed the error:

Error:Invalid Calc Script syntax [

DATACOPY "****"->"OEP_Actual"->Final->@MEMBER] Rule

My question is:

Why can the DATACOPY not be used with @MEMBER?

Or what should i do in this case?