OK, let's start by formatting your XML into a readable table:
<server>
<requests>
<Session.loginRq userName="admin" password="admin" />
<IntegrationCBO.ProcessWCFServiceRq
name="test"
binding="http"
url="http://abrxmlsearch.asmx"
searchString="53004085616"
includeHistoricalDetails="N"
authenticationGuid="88bf33e2-96a6-402c-a87047c03af2a80b">
</IntegrationCBO.ProcessWCFServiceRq>
<Session.closeRq />
</requests>
</server>
Now you can clearly see that
IntegrationCBO.ProcessWCFServiceRq
is a child of the
requests
node, not
Session.loginRq
.