我正在尝试使用python中的zeep模块发送SOAP请求。 python -mzeep XXXXXXXX.wsdl 返回以下内容：

前缀：

 xsd: http://www.AA.org/2003/XMLSchema
 ns0: http://www.bbbb.com/PM/BLS

全局元素：

 ns0:GetBalReq(header: ns0:RequestHeader,custId: xsd:string,customAvpList: ns0:AttributeValuePairList)
 ns0:GetBalResp(nalId: xsd:string,custRole: xsd:string,nalType: xsd:string,bal: ns0:BalDetailsList,customAvpList: ns0:AttributeValuePairList)

全局类型：

 xsd:anyType
 ns0:AttributeValuePair(attribute: xsd:string,value: xsd:string)
 ns0:AttributeValuePairList(item: ns0:AttributeValuePair[])
 ns0:BalDetailsList(item: ns0:BalDetails[])
 ns0:RequestHeader(auditInfo: xsd:string,transactionId: xsd:string)
 xsd:string

绑定：

 Soap11Binding: {http://www.bbbb.com/PM/BLS}BLS

服务：BLS

 Port: BLS (Soap11Binding: {http://www.bbbb.com/PM/BLS}BLS)

     Operations:
        getBalReq(header: ns0:RequestHeader,customAvpList: ns0:AttributeValuePairList) -> nalId: xsd:string,customAvpList: ns0:AttributeValuePairList

只需遵循以下步骤：

from zeep import Client
client = Client('XXXXXXXX.wsdl')
client.service.getBalReq(custId='12345678')

我收到以下错误：

"Missing element %s" % (self.name),path=render_path

zeep.exceptions.ValidationError: Missing element header (GetBalReq.header)

现在，过去两天来，我一直在绞尽脑汁，如何进行这项工作，如何发送适当的请求以获取有效的响应，阅读zeep文档，论坛等，但是却无法解决。有适当代码的想法吗？