Element attribute returned as null from Property Transfer

Hi

I have a property transfer that is set to place values into some project properties from a soap response

I have set up the property transfer using the autogenerated xpath queries and all appears fine however the one value that is always returned as [null] is one that I'm trying to get from an element attribute, when generated the xpath the value can clearly be seen in the test response used to generate the xpath,

xpath generated looks like this:
declare namespace port='http://####.####/###/###/####/port';
//port:######[1]/######[1]/Element[1]/@code

I've tried changing the last bit of the xpath to
/Element[@code]

but the response is the same

I'm confused as to how all the other values are retunred as expected but the attribute value is not

any help is appreciated
thanks
Mike