Primavera P6 Events not showing usernames for update messages

Hello!

I have successfully configured P6 Events. Now I get the following message for Activity Update event:

<?xml version="1.0" encoding="UTF-8"?><MessagingObjects xmlns="http://xmlns.oracle.com/Primavera/P6/V8.3/Common/Event" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><ActivityUpdated><Id>A1010</Id><Name>New Activity</Name><ObjectId>830084</ObjectId><ProjectObjectId>9337</ProjectObjectId><WBSObjectId>151033</WBSObjectId><NewValues><PlannedFinishDate>2014-05-30T08:00:00</PlannedFinishDate><PlannedStartDate>2014-05-30T08:00:00</PlannedStartDate><RemainingEarlyFinishDate>2014-05-30T08:00:00</RemainingEarlyFinishDate><RemainingEarlyStartDate>2014-05-30T08:00:00</RemainingEarlyStartDate></NewValues><OldValues><PlannedFinishDate>2014-05-29T08:00:00</PlannedFinishDate><PlannedStartDate>2014-05-29T08:00:00</PlannedStartDate><RemainingEarlyFinishDate>2014-05-29T08:00:00</RemainingEarlyFinishDate><RemainingEarlyStartDate>2014-05-29T08:00:00</RemainingEarlyStartDate></OldValues></ActivityUpdated></MessagingObjects>

Here I can see the old and the new values, but I do not see the username, who did it.