Datasource for real time infocube
I am new to Integrated planning. I have gone through lot of documents on the net about how to create aggregation levels,filters planning sequence etc. My question is to load the planning data from a BEx Query which is write enabled to the real time cube what should I take as datasource .i.e should i take web services as source system and create a datasource?? Can you please explain step by step how to load the plan data to the real time infocube from Bex Query?