Hi All,
I am trying to integrate salesforce with workday.
I tried with SoapUI APP for testing and its working fine but when I tried same xml in apex class using HTTPrequest its not working and throwing an error Invalid request.
Could anyone pleasde help me with this it will be appreciates.

Here is my apex code with xml string

public class Test2 {
   public static void test_m(){
     String body = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:bsvc="urn:com.workday/bsvc">'+
           '<soapenv:Header>' +
              '<bsvc:Workday_Common_Header>' +
                 '<bsvc:Include_Reference_Descriptors_In_Response>'+'1'+'</bsvc:Include_Reference_Descriptors_In_Response>' +
              '</bsvc:Workday_Common_Header>' +
           '</soapenv:Header>' +
           '<soapenv:Body>' +
              '<bsvc:Get_Customer_Invoices_Request bsvc:version="v31.1">' +
                 '<bsvc:Request_References>' +
                    '<bsvc:Customer_Invoice_Reference bsvc:Descriptor="?">' +
                       '<bsvc:ID bsvc:type="WID">a36116d317ae81ecf995ece9cxxxxxxx</bsvc:ID>' +
                    '</bsvc:Customer_Invoice_Reference>' +
                               '</bsvc:Get_Customer_Invoices_Request>' +
           '</soapenv:Body>' +
        '</soapenv:Envelope>';
       System.debug('Message'+body);
    HTTP h = new HTTP();
    HTTPRequest r = new HTTPRequest();
    r.setEndpoint('https://wd3-impl-services1.workday.com/ccx/service/XXX/Revenue_Management/v31.1');
    Blob headerValue = Blob.valueOf('ISU_XXXX_XXx@tenent' + ':' + 'XXXXX!');
   String authorizationHeader = 'BASIC ' + EncodingUtil.base64Encode(headerValue);
    r.setHeader('Authorization', authorizationHeader);
    r.setHeader('Content-Type','text/xml;charset=UTF-8');
    r.setHeader('AllowAutoRedirect', 'True');
    r.setHeader('UseDefaultCredentials','False'); 
      r.setHeader('AuthenticationLevel', 'Net.Security.AuthenticationLevel.None');
       r.setHeader('SOAPAction', 'https://wd3-impl-services1.workday.com/ccx/service/xxx/Revenue_Management/v31.1');
    r.setMethod('GET');
    r.setBody(body);
    HTTPResponse resp = h.send(r);
    system.debug('Body::'+resp.getbody());
 }
}
Many thanks,
Saniya