XML Deserialization Error

Hi,

I'm workin on a prototyp based on the netweaver developer studio preview. after i've steped to the several tutorial for webservices und webdynpro.

I've implemented a ejb/webservice combination for selecting a insurance contract from our databases based on existing java-classes to use the webservice as a model in the webdynpro-app. So fare everything worked fine.

Know I've made a little change and filled the contract with aditional information about the customer to this contract (i didn't modified the class if just filled e member of the contract which was null bevor). After deploying the webservice i got the following error message:

Service call exception; nested exception is: com.sap.engine.services.werservices.jaxrpc.exceptions.XmlUnmarshalException: XML Deserialization Error. XML is not valid. Element [urn:de.deutscherring.base]<nummer> is required in <ns16:personVn> but can not be found.

When i test the webservice i get the same error.

I've searched a the classes which a direct or indirect owned by the Person-Object and found only on member named nummer but it's an int, which can't cause trouble with deserialization.

Are anyone their wo can help me?

Thanks in advance.

Oliver