We are seeing over and over again in our BES server the following errors being thrown.

Event Type: Warning
Event Source: BlackBerry Messaging Agent BES1 Agent 1
Event Category: None
Event ID: 20499
Date: 5/28/2009
Time: 10:33:17 AM
User: N/A
Computer: BES1
{user@doimain.com} MsgMemStateDb::GetRefIdByEntryId(uc*,l) - EntryId is 0

I was able to find one ref. to this in the forum however no resolution .. Anyone have any ideas what this is and how to resolve ??