BI Integrated planning Input-Ready Query

Is it possble to create an Input-Ready query directly against a Realtime InfoCube?

I saw a statement in the TBW45 Participant Handbook on page 19 "Note: It is possible to create an input-ready query based directly on the real-time InfoCube, to add all the characteristics of the InfoCube to the query and therefoe to create an input-ready plan query without using an aggregtion level."

I have tried to do this, but the planning options in the properties of the query are greyed out and therefore I assume that an input-ready query can only be created over an aggregation level or a Multi-provider that contains an aggregated level.

Can anyone confirm this?