Adapter User-defined Message search: SOAP Header

Hi experts,

First of all – it works fine for attributes within
message payload. Now I would like to configure a search criteria for some SOAP
Header attributes. I know that I could use "dynamic header" search
criterias as well but it seems it does not work how I configured.

For example – how could I configure it for the <sap:Hop timeStamp= > which is part of SOAP Header?

<sap:HopList env:mustUnderstand="1">

  <sap:Hop timeStamp="2013-04-17T12:03:36Z" wasRead="false">

  <sap:Engine type="AE">af.d22.wxfsql01</sap:Engine>

  <sap:Adapter namespace="http://sap.com/xi/XI/System">XIRA</sap:Adapter>

  <sap:MessageId>d5b10a05-a756-11e2-c67b-000001494eef</sap:MessageId>

  </sap:Hop>

</sap:HopList>

I guess I have to use this namespace: http://sap.com/xi/XI/System/SOAP

But which dynamic Header name? There are so many in the listbox.......

Thanks and
regards

Stefan