inter-op problem between Tibco axis2 1.4.1

Question

Hi all, I have a inter-op problem probably because of a bug in axis2.

in my case axis2 is server and Tibco is client. Problem is axis2 adds a "type" attribute to "return" element.

<ns:return type="com.xx.GetGroups_Response">

and this attribute is undefined in wsdl

<xs:element minOccurs="0" name="return" nillable="true" type="ax28:GetGroups_Response"/>

with all this a .net client could use this service.

so what do you think the problem is? and can anybody offer me a workaroud?