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From: Jean-Pierre Rosen <rosen@adalog.fr>
Newsgroups: comp.lang.ada
Subject: Re: Please help!  CONSTRAINT_ERROR: access check failed - This has
 me stumped!
Date: Fri, 22 Dec 2006 14:12:28 +0100
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> The error occurs where I have a call to "anker.next" in the code.
> 
Of course. If Anker is null, you can't access anker.next