how to remove "wadl:" prefix in POST request output

Could you help me with one question,

I have the following XSD

<?xml version="1.0" encoding="utf-8"?>
<schema 
  xmlns="http://www.w3.org/2001/XMLSchema" 
    targetNamespace="http://localhost/wadl" 
      xmlns:tns="http://localhost/wadl" 
    elementFormDefault="unqualified" >
    <element name="user" minOccurs="0">
     <complexType>
      <all minOccurs="1">
       <element name="login" type="string" />
       <element name="password" type="string" />
      </all>
     </complexType>
    </element>
</schema>

and the wadl:

<?xml version="1.0"?>
<application
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation=" 
            http://research.sun.com/wadl/2006/10 wadl.xsd 
            http://localhost/wadl sis.xsd"    
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"   
    xmlns:sis="http://localhost/wadl" 
    xmlns="http://research.sun.com/wadl/2006/10" >
 <grammars>
  <include href="sis.xsd"/>
 </grammars>
 <resources base="http://192.168.10.139">
  <resource path="/user/sign_in">
   <method name="POST" id="Authentication">
    <request>    
     <representation mediaType="application/xml" element="sis:user"/>
    </request>
    <response status="201">
     <representation mediaType="application/xml" element="sis:user"/>
     <fault status="401" />
    </response>
   </method>
  </resource>
 </resources>
</application>

And in soapUI Pro (3.6.1) I got the next output:

<sis:user xmlns:wadl="http://localhost/wadl"><login>45</login><password>35353</password></sis:user>

How can I get output without "sis:" prefix as below?

<user xmlns:wadl="http://localhost/wadl"><login>45</login><password>35353</password></:user>

I've tried to set elementFormDefault="qualified" but got worse result with prefix "sis:" for all entities (i.e login and password)

Very appreciate your help.