Incorrect SOAP request generated with extended xml-type #1461

<?xml version='1.0' encoding='utf-8'?>
<soap-env:Envelope xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/">
 <soap-env:Body>
  <ns0:GetDeptListRequest xmlns:ns0="http://atoss.com/ses/services/masterdata/dept-1.0">
   <ns1:Credentials xmlns:ns1="http://atoss.com/ses/services/masterdata/types-1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ns1:ListServiceRequest">
   <ns1:Credentials>
    <ns1:Logonid>xxx</ns1:Logonid>
    <ns1:Clientno>xxx</ns1:Clientno>
    <ns1:Password>xxx</ns1:Password>
   </ns1:Credentials>
   </ns1:Credentials> 
  </ns0:GetDeptListRequest>
 </soap-env:Body>
</soap-env:Envelope>

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" 
                                xmlns:dept="http://atoss.com/ses/services/masterdata/dept-1.0" 
                                xmlns:typ="http://atoss.com/ses/services/masterdata/types-1.0">
   <soapenv:Header/>
   <soapenv:Body>
      <dept:GetDeptListRequest>
         <typ:Credentials>
            <typ:Logonid>xx</typ:Logonid>
            <typ:Clientno>xx</typ:Clientno>
            <typ:Password>xxx</typ:Password>
         </typ:Credentials>
      </dept:GetDeptListRequest>
   </soapenv:Body>
</soapenv:Envelope>

<xs:element xmlns:xs="http://www.w3.org/2001/XMLSchema" name="GetDeptListRequest">
  <xs:complexType xmlns:xs="http://www.w3.org/2001/XMLSchema">
   <xs:complexContent xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:extension xmlns:xs="http://www.w3.org/2001/XMLSchema" base="wstypes:ListServiceRequest"/>
   </xs:complexContent>
 </xs:complexType>
</xs:element>

from zeep import Client, Settings
from zeep.transports import Transport
from requests.auth import HTTPBasicAuth
from requests import Session


WSDL_URL = "https://ases-abn.example.com/SES/services/masterdata/dept-1.0.wsdl"
USER = "xxx"
PWD = "yyy"
CLIENTNO = '123'
 
# Override post to store xml request and response
# see https://github.com/mvantellingen/python-zeep/issues/603
class Transport(Transport):
    def post(self, address, message, headers):
        self.xml_request = message.decode('utf-8')
        print(f"XML Request: {self.xml_request}")
        response = super().post(address, message, headers)
        self.response = response
        print(f"XML Response: {self.response}")

        return response


session = Session()
session.auth = HTTPBasicAuth(USER, PWD)
client = Client(wsdl =WSDL_URL,
                transport = Transport(session=session)# with basic auth
                )

#print(client.wsdl.dump())


credentialsType = client.get_type('ns1:CredentialsType')
listServiceRequest = client.get_type('ns1:ListServiceRequest')

factory = client.type_factory('ns1')

credentials = factory.CredentialsType(
                    Logonid=USER,
                    Password=PWD,
                    Clientno=CLIENTNO
                    )
request_data = factory.ListServiceRequest(
                    Credentials = credentials
                    )

response = client.service.GetDeptList(request_data)
#print(response.content)