SQL query with From table being entered in twice

I have a query that is doing an exist clause with the inner select statement querying the T_PROJECTS table using two different alias "t3 & t2".
SELECT t0.ID, t0.EFFECTIVEDATE, t0.CUSTOMERID, t0.PROJECTID, .... FROM T_FINANCIALDATAS t0 WHERE ((t0.PROJECTID = 2271) AND (EXISTS (SELECT t1.TMPUSERID FROM T_PROJECTS t3, T_PROJECTS t2 , T_PROJECTSUSERS t1 WHERE (((( t2.CUSTOMERID = 1) AND (t1.USERID = 2276)) AND (t1.PROJECTID = t3.ID )) AND ( t2.ID = t1.PROJECTID))) AND (t0.CUSTOMERID = 1)))
They need to be combined so I'm using only one table alias. They way the query get's built is a little complicated. The Exist clause get's built as a ReportQuery and then that get's passed into another method which eventually is added to a top level Expression as such:
ReportQuery existsQuery = new ReportQuery(existsClass, existsExpressionHolder.getExpression());
expHolder.addAnd(expHolder.getExpressionBuilder().exists(existsQuery));
Question: what causes the double table alias from showing up? From what I read it seems like it's caused when you use two different ExpressionBuilders?

Could you include the code that builds the Expression.
Perhaps try to reproduce the issue in a simple isolated example. Generally every ExpressionBuilder used in a query represents a table/alias.
What version of TopLink are you using?
The duplicate alias seems repetitive, but doesn't seem like it will have any effect on the query result, other than its efficiency.
James : http://www.eclipselink.org

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