User Credential passed in customised tag in soap message

Hi

We have PO 7.31 exposed a web service. When we use SoapUI, it is successful.

When actual consumer call this web service with basic authentication, the user name and password are passed in customized soap header tag.

e.g.

<soapenv:Header/>

      <CustomerTag>

                  <UserID>xxxx</UserID>

                  <Pwd>*******</Pwd>

      </CustomerTag>

<soapenv:Header/>

Therefore our server does not pick them up. Client side got "401 Unauthorized"

* We do not want to disable user authentication

Anyone has idea how we allow server to authenticate the user ?

Thanks

-Liang