Man pages matching name ur::object::type::accessorwriter::sum in section 3pm:

UR::Object::Type::AccessorWriter::Sum.3pm.en	debian 10 / libur-perl
UR::Object::Type::AccessorWriter::Sum.3pm.en	debian 11 / libur-perl
UR::Object::Type::AccessorWriter::Sum.3pm.en	debian 12 / libur-perl