Consume External Web Service from ABAP

Hello All,

I have a Web Service existing on a Non R/3 system.

I want to access this Web Service from my Development system (SAP 6.40).

I created a Client Proxy pointing to this WSDL named "ZUSER_ARS_EXCHANGECO_UPDATE".

I have created an FM to call this Web Service and update the data to it with the following code ->

DATA: lv_proxy TYPE REF TO zuser_ars_exchangeco_update,
        ws_header TYPE REF TO if_wsprotocol_ws_header,
        sys_fault TYPE REF TO cx_ai_system_fault,
        appl_fault TYPE REF TO cx_ai_application_fault,
        lv_request TYPE zuser_ars_exchangecreate_soap1,
        lv_response TYPE zuser_ars_exchangecreate_soap.

  TRY.
      CREATE OBJECT lv_proxy
      EXPORTING
        logical_port_name = 'TO_ARS'
          .
    CATCH cx_ai_system_fault .
  ENDTRY.

  MOVE-CORRESPONDING ip_userdata TO lv_request-parameters.

  TRY.
      CALL METHOD lv_proxy->create
        EXPORTING
          input  = lv_request
        IMPORTING
          output = lv_response.
    CATCH cx_ai_system_fault INTO sys_fault.
      IF sys_fault IS NOT INITIAL.
        RAISE proxy_create_system_fault.
      ENDIF.
    CATCH cx_ai_application_fault INTO appl_fault.
      IF appl_fault IS NOT INITIAL.
        RAISE proxy_create_appl_fault.
      ENDIF.
  ENDTRY.

But when I am trying to execute, I am getting the error "cx_ai_system_fault " with the following Error Text -> "ARERR [149] Im Steuerungsdatensatz muss ein Benutzername angegeben werden." When translated to English, using Google, it is "ARERR [149] The control record must be a user name."

The WSDL has a line as follows -> soap:header message="s0:ARAuthenticate"

How do I pass the username and password to this "ARAuthenticate" parameter?

Can someone please help me in getting this fixed?

Thanks and Regards

Gladson Jacob