If you want to send a sample XML bean request to one of your webservice operation using SOAP UI.
You will have to take care of some points while constructing the xmlbean sample request:

1. Replace < with "&lt ;" without space
2. start immediately after your operation parameter that is going to enclose the sample request with the request tag.
3. this request tag should include the xmlns attribute relevant to your XSD.
   ex: xmlns="http://www.xmlbean.project.company.com"