This is by default not possible. Your only option would be to use a domain to xml mapping activity and then read the xml as a string using the community commons StringFromFile() java action.
You can then replace the namespace by one of your own. And do the webservice call with a custom java action
private IWebserviceResponse callWebservice(String location, String soapAction, String soapRequestMessage) throws WebserviceException, IOException{
IWebserviceResponse WebserviceResponse = com.mendix.core.Core.callWebservice(location, soapAction, soapRequestMessage);
return WebserviceResponse;
}
private String WebserviceResponseToString(IWebserviceResponse webserviceResponse) throws IOException {
StringWriter writer = new StringWriter();
IOUtils.copy(webserviceResponse.getStream(), writer, "UTF-8");
String theString = writer.toString();
return theString;
}
Which from which you will get the response in string format. You can then turn that string to a file document by using the CommunityCommons java action StringToFile(). And us a microflow activity "Import XML" to actually map that XML to your data.
Or you could just accept the ns1 namespace :)