elsif new.version != old.version
raise OSM::APIVersionMismatchError.new(new.id, new.class.to_s, new.version, old.version)
elsif new.changeset.nil?
raise OSM::APIChangesetMissingError.new
elsif new.changeset.user_id != user.id
raise OSM::APIUserChangesetMismatchError.new
elsif new.version != old.version
raise OSM::APIVersionMismatchError.new(new.id, new.class.to_s, new.version, old.version)
elsif new.changeset.nil?
raise OSM::APIChangesetMissingError.new
elsif new.changeset.user_id != user.id
raise OSM::APIUserChangesetMismatchError.new