I have created a very simple service in peoplesoft.  All it does is take two numbers and returns the sum.  I know this service works through manually sending soap requests to the service.

I am able to generate apex classes via the wsdl2apex generator.

However, when I use those classes to do the callout, I get the following error:

System.CalloutException: Web service callout failed: Unable to parse callout response. Apex type not found for element http://xmlns.oracle.com/Enterprise/Tools/schemas/TI_RESULT_SIMPLE.V1=result 

Class.BOSSMathService.MathServiceSimple_Port.Add: line 20, column 13
Class.PricingCalculator.test: line 78, column 48
External entry point

My generated class:

//Generated by wsdl2apex

public class BOSSMathService {
    public class MathServiceSimple_Port {
        public String endpoint_x = 'http://mypsoftwebsite.com/PSIGW/PeopleSoftServiceListeningConnector';
        public Map<String,String> inputHttpHeaders_x;
        public Map<String,String> outputHttpHeaders_x;
        public String clientCertName_x;
        public String clientCert_x;
        public String clientCertPasswd_x;
        public Integer timeout_x;
        private String[] ns_map_type_info = new String[]{'http://xmlns.oracle.com/Enterprise/Tools/schemas/TI_ADD_SIMPLE.V1', 'BOSSAddInput', 'http://xmlns.oracle.com/Enterprise/Tools/schemas/TI_RESULT_SIMPLE.V1', 'BOSSResult', 'http://xmlns.oracle.com/Enterprise/ERP/services/MathServiceSimple.1', 'BOSSMathService'};
        public Integer Add(Integer num1,Integer num2) {
            BOSSAddInput.Add_element request_x = new BOSSAddInput.Add_element();
            BOSSResult.ResultGroup_element response_x;
            request_x.num1 = num1;
            request_x.num2 = num2;
            Map<String, BOSSResult.ResultGroup_element> response_map_x = new Map<String, BOSSResult.ResultGroup_element>();
            response_map_x.put('response_x', response_x);
            WebServiceCallout.invoke(
              this,
              request_x,
              response_map_x,
              new String[]{endpoint_x,
              'Add.V1',
              'http://xmlns.oracle.com/Enterprise/Tools/schemas/TI_ADD_SIMPLE.V1',
              'Add',
              'http://xmlns.oracle.com/Enterprise/Tools/schemas/TI_RESULT_SIMPLE.V1',
              'ResultGroup',
              'BOSSResult.ResultGroup_element'}
            );
            response_x = response_map_x.get('response_x');
            return response_x.result;
        }
    }
}

Here is the code that invokes the callout:

BOSSMathService.MathServiceSimple_Port msp = new BOSSMathService.MathServiceSimple_Port();
		
System.debug('result = ' + String.valueOf(msp.ADD(4, 10)));

I know the request is being processed and that something is being returned from PeopleSoft via the Psoft logs.  Here is the raw xml coming back from the service:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <soapenv:Body>
      <ResultGroup xmlns="http://xmlns.oracle.com/Enterprise/Tools/schemas/TI_RESULT_SIMPLE.V1">
         <result>10</result>
      </ResultGroup>
   </soapenv:Body>
</soapenv:Envelope>

Any ideas?