Imported From: http://groups.google.com/group/in-portal-bugs/browse_thread/thread/6de9dab557030dc3#
There is ability to set custom id field to used during "grid" block
rendering by using "IdField" parameter. When you try to set it to other
field (not default id field for given unit config), then you got a lot of
warnings.
It happens, because PrintList tag expects that IdField parameter to be given
under different name: "id_field".
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