Error implementing Web Service of PI7.0

Hi all:

We released a Web Service in PI. But when we implement it from Web Dynpro, it throws the "SOAPFaultException" exception.Detail message is:

http://schemas.xmlsoap.org/soap/envelope/">

http://sap.com/xi/XI/Message/30" SOAP:mustUnderstand="1"> XIProtocol

<SAP:Code area="PARSER">UNEXPECTED_VALUE</SAP:Code>

<SAP:P1>Main/@versionMajor</SAP:P1>

<SAP:P2>000</SAP:P2>

<SAP:P3>003</SAP:P3>

<SAP:P4/>

<SAP:AdditionalText/>

<SAP:ApplicationFaultMessage namespace=""/>

<SAP:Stack>XML tag Main/@versionMajor has incorrect value 000; expected value is 003&#xd;</SAP:Stack> </SAP:Error>

</detail>

Has anybody met this problem before?