Hi,
I was too quick with my first Response.
I found out what Needs to be done.
Aliasses, internal or external ones, to SICF Services that belong to SOAP runtime, meaning Services that are defined in SOAMANAGER, are not to be maintained in SICF.
Instead you define an alternative Access URL in the Transport Settings of your Service configuration in SOAMANAGER. This will be shown in SICF as an external alias.
In SOAMANAGER find your Service, edit the configuration. open the Transport Settings tab, enter there an alternative URL. Save your Settings.
