If you have experienced issues when moving from Salesforce.com API version 10.0 to 11.1, you might want to take a look at your content headers and security setup.  Following is the error you might receive in Oracle BPEL:

<remoteFault xmlns=”http://schemas.oracle.com/bpel/extension”>
<part name=”summary”>
<summary>
exception on JaxRpc invoke: HTTP transport error:
javax.xml.soap.SOAPException:
java.security.PrivilegedActionException:
oracle.j2ee.ws.saaj.ContentTypeException:
Not a valid SOAP Content-Type: text/html; charset=UTF-8
</summary>
</part>
</remoteFault>