Problem on Webservice Start, input binary PDF

Hi all,

i have a problem with BINARY input DATA of the start webservice of my BPM process.

The process start regulary from my webdynpro java and work as i want, the problem is after to the next STEP into the other webdynpro.

When i try to open the file i got this message:

File does not begin with '%PDF-'.

if i ADD new files and go in nexts STEP, i can open the files regularly.

So the problem is to the webservice request call.

I tried to ENCODE and DECODE the binary with no results, the WSDL/XML encoding is UTF-8.

Someone of you know what the hell happen?

Thanks Roberto