negative space information

why does sp_spaceused report negative values for space?
exec sp_spaceused ResourceCompetency
name rows reserved
data index_size unused
----
ResourceCompetency 7602 -56 KB
816 KB 656 KB -1528 KBThis happens because of the inaccuracy exists between the sysindexes table.
Run
DBCC UPDATEUSAGE ... WITH COUNT_ROWS
to correct this inaccuracy.
--
-Vishal
"Will Mullen" <will.mullen@.windriver.com> wrote in message
news:01b101c3716c$768e9bd0$a101280a@.phx.gbl...
> why does sp_spaceused report negative values for space?
> exec sp_spaceused ResourceCompetency
> name rows reserved
> data index_size unused
> ----
> ResourceCompetency 7602 -56 KB
> 816 KB 656 KB -1528 KB
>