[AccessD] Error 2501, 'the open form action was cancelled'

Hi all

A quickie, I hope... I am getting error 2501 when trying to open a form and
filter it to a single record. The thing is this only happens for certain
records - for most records it is fine, but when it breaks, it breaks
reliably. The records are in the dataset behind the target form. I can open
the form showing all records and filter for the specific ones I want, using
the same field I'm passing in the openform statement. I can stick the
criterion in the underlying query and that works fine too. But it won't open
the form to these  records using docmd.openform.

I have compacted and repaired the database, and I've tried creating a new
form and linking from there in case the calling form was corrupt. It doesn't
work from the new form either.

Any ideas? Any help would be much appreciated

Roz

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