On the Designer menu bar, click Tools, and then click Manage Field Mappings.
Click Add.
In the New Web Service dialog box, next to Service Name, select the imported script from the drop menu.
Next to Group, type a name for the group, and then click OK.
Note that now you won't see the Use SAP Credentials checkbox in the Manage Field Mappings screen, and you will see the following fields as Input Values:
WindowsUserName
WindowsPassword
Configuring X509 certificate and Kerberos based SAP SSO logon