Man pages matching name rose::db::object::metadata::relationship::onetomany in section 3pm:

Rose::DB::Object::Metadata::Relationship::OneToMany.3pm.en	debian 10 / librose-db-object-perl
Rose::DB::Object::Metadata::Relationship::OneToMany.3pm.en	debian 11 / librose-db-object-perl
Rose::DB::Object::Metadata::Relationship::OneToMany.3pm.en	debian 12 / librose-db-object-perl