Problem changing namespace

Hi, we have a channel set up that receives a HL7 messages and outputs it in XML, but we are having problems with the namespace, the namespace we need to appear is the following



<ORU_R01 xmlns="urn:hl7-org:v2xml">



But when we try and set the namespace using the following code



var ns = new Namespace('urn:hl7-org:v2xml');

tmp.setNamespace(ns);



The following appears



<e4x_0:ORU_R01 xmlns:e4x_0="urn:hl7-org:v2xml">



We have strip namespaces ticked because we are using an outbound template.



We are using Mirth Connect Server 2.2.1.5861



If anyone could point us in the right direction that would be great



Thanks

Problem changing namespace