I have a form with a postscript attachment which is called either 'before the document' or 'after the document'.
When I try and delete the attachment, I get a dialogue box asking "how do you want to handle references to this element". I select "delete all elements".

When I try and look at the attachments called by the document, (format/document/attachments) I get "Exception EStringListError in module PPress.exe at 0002341D. List index out of bounds (-1)".