Seam does not have a integration with web service framework like Apache Axis or Apache CXF. But, it is not saying you can not use. In fact, I have been using both frameworks in seam's projects and everything is normal!
Have you tried using JBoss' wsconsume against the web service, and simply use the generated classes? That's what I've done, and it works just fine.
wsconsume -k -p your.package.name.here http://your.webservice.wsdl.location.here
Yes I was using all the classes that the wsconsume created, and in a Standalone client they worked perfectly, but when I tried to use the client inside SEAM I kept getting a ClassNotFoundException and I had no idea why... Turns out that I had to export my client as a .jar and then place that jar inside the JBoss\jboss-5.1.0.GA\server\default\lib folder for me to be able to use it.
But well, problem fixed! Moving on!
Thanks for your help!
I took a similar approach, but placed the jar within the EAR.