Integration

I am trying to invoke a PartnerLink web service that requires wsse headers with nonce and created date values passed. I modified the properties on the partner link to add wsseHeaders, wsseUsername and wssePassword. Those are all being added to the SOAP header correctly. However, I can't seem to find anyway to add the wsse:Nonce and wsse:Created values to the header.

Can this be done from inside BPEL PM? If it needs to be done through bpelx:inputHeaderVariable, how do I generate the values for those fields?

Thanks,
Greg