Try Alive PDF, it's awsome
I just try <a href="http://www.alivepdf.org/">Alive PDF</a> a great Action Script 3 library.
With that you can easily build pdf form, on top of a flex application.
I did a test case in BSP and it worked greeat (if anyone is interested i'll try to blog it )
Good bye ADS, Smartforms, SAPscript
Long live Alive PDF
great sunday to everyone