Using BSSV on Weblogic 11g

Hi,
Has anybody tried using standard BSSV in a Weblogic Server? 

If so, I´ll be very grateful if you could send me an xml example for processPurchaseOrder WS.
I´m trying to add a Purchase Order but always get the following error:


<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<env:Header/>
<env:Body>
<env:Fault>
<faultcode>env:Server</faultcode>
<faultstring>For input string: ""</faultstring>
<detail>
<java:string xmlns:java="java.io">java.lang.NumberFormatException: For input string: ""</java:string>
</detail>
</env:Fault>
</env:Body>
</env:Envelope>

But it gives me no information about which string it´s wrong.