Use drop function replication definition to drop a function replication definition before you recreate it, in order to change or remove parameters, or to rename a function replication definition.
drop function replication definition function_rep_def
Re-create the function replication definition after you drop it. When you drop a function replication definition, the associated user-defined function and function string are also dropped. Subscriptions to a function replication definition must be dropped first. You can re-create the subscriptions after you re-create the function replication definition.