Last write date for disk volumes

[Thomas Denier]

I manage a 4.2.1.9 server running under OS/390. When I run a 'query volume'
command against my disk storage pool volumes the 'Approx. Date Last Written'
fields are blank. When I execute 'help q v' the online help
includes sample output showing a last write date for a disk storage
pool volume. Am I the victim of sloppy code or sloppy documentation?