as suggested here: http://forums.adobe.com/message/5429652
I have a PDF (DOC1) with a PDF attachment (DOC2). DOC2 is a dynamic interactive form made with Livecycle.
Each time I push a button on DOC1, DOC2 is opened if not already so and a new row is added to a table in DOC2. However, I noticed that when I close DOC2 and push the same button on DOC1, DOC2 gets opened and all rows added in a previous session are still there. They disappear only once I close DOC1, reopen DOC1 and push the button again.