Just know, I installed the LiveCycle ES4 and tried to add the
import/export feature on my PDF form. Everything was fine, there wasn't
any error message. But when I opened the PDF, it showed me:"This
document enabled extended features in Adobe Reader. The document has
been changed since it was created and use of extended features is no
longer available. Please contact the author for the original version of
this document."Anyone can help me to figure out this issue?