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WebService Called Error with Web Dynpro

Dears,

It's my message error and i dont know whats happened.

I dont know if de call is wrong or my WebService ZMANPP001 is down, or the path to call it it's incorrect... well ... i dont know what's happened

Here's the error message

Service call exception; nested exception is: com.sap.engine.services.webservices.jaxrpc.exceptions.XmlM
arshalException: 
XML Serialization Error. Property [RETURN] of class 
[xiwebservice.model2.proxies.types.ZMANPP001] must exist 
and can not be null. This is required by schema 
description.

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