XmlUnmarshalException: XML Deserialization Error Please Help!!!

Hi All,
I am consuming the standard webservice
Name: /SAPAPO/SDM_PARCRTRC
I am getting the following error on execution of the web service:
Service call exception; nested exception is: com.sap.engine.services.webservices.jaxrpc.exceptions.XmlUnmarshalException: XML Deserialization Error. XML is not valid. Element []<ScheduleLine> is required in <NameSpecification> but can not be found.
Please help me with this problem.
Thanks in Advance.

Hi All,
Thanks for your replies.
They were helpful but this what I did that solved the problem
I used the following code to set the required parameters
item.getOriginalBean().setScheduleLine(new ScheduleLineInner[] {scheduleLine.getOriginalBean()});
instead of
item.addScheduleLine(scheduleLine);
Similarly all the parameters were set using the orginalBean
Now it is working perfectly fine....
Thanks a lot..
Setu

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