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Strange problem when using HAVING() and Doctrine_Pager

My program generates this DQL using echo $q->getDql(); reformated for easier reading:

SELECT o.*, t.*, COUNT(开发者_开发问答t.id) AS num_of_reservations 
FROM Property o 
LEFT JOIN o.Reservation t 
  WITH t.status=? AND 
 ( (t.start_date<=? AND t.end_date>=?) 
  OR (t.start_date>=? AND t.start_date <= ?) ) 

GROUP BY o.id 
HAVING num_of_reservations < o.nr_of_bookings

Using PHP unit tests, I get results as expected. However, when I send this Doctrine_Query to Doctrine_Pager, I get this error:

Fatal error: Uncaught exception 'Doctrine_Connection_Mysql_Exception' with message 'SQLSTATE[42S22]: Column not found: 1054 Unknown column 'p.nr_of_bookings' in 'having clause'

I tried all combinations like using having('COUNT(t.id)..... ) etc, different SELECT combos, all results picked by $q->execute() are good except when I send it to pager.

Can somebody help me with this? I even tried

FROM Property p 
instead of 
FROM Property o

no difference at all.

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