Openfire + External DB not saving conversations

Hi, I’ve been using openfire with the embbeded DB and it worked well. Now I’ve changed to an external Oracle DB and there is a problem with saving the conversations. I’ve installed the monitoring plugin and checked the options for archiving conversations one on one in openfire. When I look into the ofconversation data in my DB is empty. But the ofmessagearchive data has all the message I’ve sent. Any idea of this problem? Why is it saving the messages but not the conversations?