XML format change?

Hi eXperts,

When calling a webservice(Siebel), the customer is asking for messages of this format:

<ConfirmationMessage>

<xiOutputCode&GT 200&LT/xiOutputCode>

<xiOutputMessage&GT Ok&LT/xiOutputMessage>

<\ConfirmationMessage>

They are not accepting "<" and ">", but only &lt and &gt. I've never met such problems before, has any one any ideas?

Any hints are highly appriciated.

Thanks in advance

Luis