When Entity Bean activation count will be released?

Hi, I had a question in my production site.
One enity bean - LoanEntity's activation count is increased and increased, never
be released during the application startup.(can be seen in the weblogic monitoring
console). and the cache hit count=0 for the whole time.
but the other entity beans, implemented in the same way( such as equals() mehtod,
and hashCode()), cache hit count increased, and activation count is not increased
so much.
I'm wondering to know, when the activation bean will be released, after the transaction
end? but why the loanenity is never released-the transaction time is set to 600seconds
for some reason, but not for the whole time.
the system is run on weblogic6.1sp4.windows2000professional

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