How to Drop and Create funtion

 Hi

    I replicate the database with my production  and Report Server environment, I change some funtions  in devlopment and try to drop and recreate the funtion in production  ,It showsCannot drop the function 'XXXX' because it is being used for replication.
Msg 2714, Level 16, State 3,
  How to drop this funtion? do i need to change any settings? I need to drop and create this funtion? how to achive it?

Thanks & Regards Manoj