Hi Sandra,
I don't know if it helps, but I ultimately went a different direction and added the SOAP header as laid out in this post: http://scn.sap.com/thread/1706794. I copied Marcello Urbani's code and replaced the SOAP header structure with my own (what the API provider offered as an example) and it worked perfectly.
It wasn't much work, and took the guessing out of editing the WSDL.