Number of cached history pages 
Number of cached history pages (<number>) exceeds number of cached OMS pages (<number>)
This
message can occur for
liveCache
instances only.
In the
data
cache, the number of history pages is higher than the number of OMS data
pages.
Search
for old
OMS
versions and transactions that prevent the history pages from being
deleted in the data cache.
Check
whether the reports /SAPAPO/OM_REORG_DAILY and /SAPAPO/OM_DELETE_OLD_SIMSESS
are being executed at regular intervals (see also
Monitoring OMS
Versions).).