Problem description
For sure based on Commonalities you normally can also use a protocol-property.
This property is not used in CarrierBilling (for now).
So I guess this reference can be removed.
sink:
type: string
format: url
description: The address to which events shall be delivered using the selected protocol.
example: "https://endpoint.example.com/sink"
Expected behavior
sink:
type: string
format: url
description: The address to which events shall be delivered.
example: "https://endpoint.example.com/sink"