Not a Valid attribute in Outbound Sync Rule

Hello,

Group having a location attribute in FIM portal, While mapping the DN with the location it showing error message Location is not a valid attribute.

Custom Expression is 

IIF(Eq(location,"Bangalore"),"CN="+displayName+",OU=Bangalore,DC=XXX,DC=com",IIF(Eq(location,"Pune"),"CN="+displayName+",OU=Pune,DC=XXX,DC=com",Null()))

Schema

Kindly advice,

Thanks and Regards,
Anirban Singha
http://a-zenith.blogspot.in/