Have you tried quoting the field name, you're using a mixed case field name
and AFAIK, if you don't quote PostgresSQL looks for the field in lowercase,
only quoting preserves the case as you want it.
Next:From: Carel CombrinkDate: 2010-05-10 10:12:17
Subject: C-Function: Returning Rows
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Subject: Re: field names for new in trigger function