Webservice client XML namespaces

I have updated an app from D2007 to D10.4.2. In it is an imported class library from a web service.

When I send a request in 10.4 the xml has different namespace tags from 2007 (causing a validation error on the webservice end). My app code is identical and I am not explicitly setting any namespace info.

What determines the namespace tags when my code is the same. How can I control and set the simple NS1 name space in D10.4?