Hi Alain,
I haven't experience in this concrete case but i have had to deal with similar cases. First of all, you should to download to local all the XSDs and wsdl files and to check if you can test the webservices in local. When you finally test them you should to try to upload all the schemas to the ESR and to check that all the dependencies are right, sometimes it' s necessary to modify the dependencies between files or any tag because different PI versions dont support all the XSD/WSDL capabilities. Finally, you can develop the entire ???-SOAP scenario quickly.
Regards.