#161 Attached files bug on copy

[Ladjemi Bader]

Zope 2.7.7
Archetypes 1.3.3-final
ATContentTypes 0.2.0-final (CVS/Unreleased)
PloneArticle 3.18 3.18
AttachmentField 1.3RC4 1.3RC4
Plone 2.0.5

During the attachment of a file to a PloneArticle, if I
copy a file I've attached, this file become the only
one which appears. if I upload any another file, this
new file doesn't appear and the copied one appears
instead.