Answered
Hi, I have created a Form using Live Cycle Designer. But when I am trying to add this form into an existing PDF file an error message shown in Adobe Acrobat 8.
ERROR MESSAGE :"You Cannot insert pages from an Adobe XML Form into another PDF file. To include Adobe XML form into other PDF file. please use the following menu option: Document-->Attach a file."
Is it possible to insert/include that Adobe XML Form page into the PDF in any other way?
A workaround is to open your existing PDF in Designer, "converting" it to a fixed layout form. Save it like a form...then open your existing form. Combine the two (by inserting). Save the new file and reopen/enable through Professional. You'll be able to keep the PDFs together visually through Professional and still use the interactive form you already made.
Sorry it's not better news!