Accessing WSE 1 enabled web service from Delphi. Possible ?

I have wse enabled service on a server and making Delphi application using
SOAP to access this service. I stuck with WSE security...always getting error
like

System.Web.Services.Protocols.SoapExeption: Server was unable to process
request --> System.NullReferenceException: Object reference not set to an
instance of am object.

at ....Web.NSNewsReader.CheckRequest(String&userName)
at ....Web.NSNewsReader.CheckUser()


Where I can read about it more? Anybody have this experience to develop
win32 clients under Delphi7 ?

Your help will be very appreciated.
Regards,
Alex