Just created a function in EDBManager and I obviously added a space at the end of the parameter (Separator) name.
CREATE FUNCTION "RCF" (IN "In1" VARCHAR COLLATE ANSI, IN "In2" VARCHAR COLLATE ANSI, IN "Separator " VARCHAR COLLATE ANSI)
Doesn't make any difference when running the function, but you might want to add it to your list of "minor things to tidy up when I've got nothing better to do"