Back to Back Sales Orders in Supply Planning and Demand Planning

Summary:

Our customer is using back-to-back fulfilment technique.

We need a confirmation if Back-to-Back Sales Orders are considered for Demand and Supply Planning.

Does the Demand Planning look at Back-to-back Sales Order as demand and plan for it? and than supply plan again creates a supply order.

We know that Back to Back already creates a supply order, We want to know what happens in planning engine for this