Hi Mikael,
I will be happy to clarify this for you, you are also welcome to contact me via mail for more information on Cloud Portal licensing and capabilities.
Let’s me clarify the dilemma for you, Hana Cloud Portal is a service on top of the Hana Cloud Platform, the connectivity to on-premise backend systems can be configured via SAP Connector / Getaway as a service which are provided via Hana Cloud Platform.
Once you have be setup the connectivity you can enhance it with creating site and widgets on top of cloud portal, that consume data from the on premise systems. The Cloud Portal is Complementary product provides you the ability to create state of the art sites and widgets which connect to the on premise application and retrieve the on premise data (via the sap connector).
The license for cloud portal already includes several Hana Cloud Platform resource such as HCP account and bandwidth, so when you purchase Cloud Portal you also receive some of the Hana Cloud platform resources.
Best Regards,
Ofra